{
  "manageEntity": {
    "action": "Save",
    "entityId": "288395",
    "entityType": "Track",
    "nonce": "0x0643df9fcbbdef4361d740770200e7197fb1ef4f67e58a851c996993e3c6d433",
    "signature": "0x60109ff3c225242e5b0b9662962106df9c2c7c47041928f5d4a160e44e8dd3625831ec71944067d7ebf1f00ca84be9715945fc0723e27158ec5f2c265cbdb6b31b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}