{
  "manageEntity": {
    "action": "Save",
    "entityId": "278282540",
    "entityType": "Track",
    "nonce": "0x4efc1973b20f2fb961496ee20ca85699c9e22617add1a097da7b04d39f7a4433",
    "signature": "0x436f524ad836b318ed14a0a42ca2fd59e46ca2891b5457e9a4619969bb187b792ac65df0b0bab95bae05fc61b9b98ae1ee5f030a9d207642da266083ed1894281c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}