{
  "manageEntity": {
    "action": "Save",
    "entityId": "394758944",
    "entityType": "Track",
    "nonce": "0x0c47e6faab9341f4a03b9fec3ec5be0f00531f07e90d8520a84d22514d744c53",
    "signature": "0x5945cb92531c0483f4d5a0fa9353f2b5cc5d3354dc7372a6832a93563cb0f1600525818b51c71201c905de326adcba18676922dd7d6332ae6a18b8dcc1117dd71c",
    "signer": "0x15A2d8daAAd4924f264fF43629DCFA026583216c",
    "userId": "149116140"
  }
}