{
  "manageEntity": {
    "action": "Save",
    "entityId": "389476891",
    "entityType": "Track",
    "nonce": "0xe9e46cc740643ff7292a4509bea9d299437e4cbd1aa554c172c5ce4cac788325",
    "signature": "0xa051a02b901570089de16f8b01b67499cfb36e5557d39f33d912e4433882c8921aa4f2c4d03e8e2b244cf8d3388249e552375af2a254a9a606558c647e9350201b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}