{
  "manageEntity": {
    "action": "Save",
    "entityId": "1892405197",
    "entityType": "Track",
    "nonce": "0xdf17c1cf07cf3d7b52f94257533dbc8a2cd1d4caec219efbea2ce8992afb21ed",
    "signature": "0xbb55afe74856855be516a0e65119d081da1d7bc39cc13ab8d594a420db798bce3adc385b2d51faba31f9f2bdcb4496d5b6b6f0af2787c3d6e947e5379ab452211c",
    "signer": "0x669C207e15A757a751fd8f623DFf054C6D3D0b05",
    "userId": "121458"
  }
}