{
  "manageEntity": {
    "action": "Save",
    "entityId": "1446929338",
    "entityType": "Track",
    "nonce": "0xf370d45ec2caee113426c65d5411a6e426fcfcd5e4fba3cfd3c80d6afc199a6e",
    "signature": "0x3baf66a1ce39a02afa0a86f51fcf09741069ad84cf1bfccb46732c6b6bfba26c7731dd6495e98e578d21dbf2a48fe8f3978dac977a6f3369f5e08df87103c3481c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}