{
  "manageEntity": {
    "action": "Save",
    "entityId": "273874",
    "entityType": "Track",
    "nonce": "0xd9ff4d73ebe20f55cb07d606a062548f5afac764f2952af60936dc9cda91cd72",
    "signature": "0xa4e84bb6c6c95dd6482a35720a1bdfc96cee1debff2279214fa2258ba258ad9e21e0e4753655e34a39c82ce445eec11d9442284ae0b263e720692c863baa56351c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}