{
  "manageEntity": {
    "action": "Save",
    "entityId": "604148143",
    "entityType": "Track",
    "nonce": "0x37a9b030500ced0821819d648c158c30da2b524610ad9f1d6d5aa590cf84b7e8",
    "signature": "0xd0daa6256c14a63da2109ebebed7c17f15cda78201561579a01159578d13e3d532ff44d048f08010c1886e608d980d9219f0f5fdddc66cb7c45bbba9cc81b4c31b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}