{
  "manageEntity": {
    "action": "Save",
    "entityId": "1957854805",
    "entityType": "Track",
    "nonce": "0x5886c04785b957eb3a6680b7a5960bb65b651559b558ed19b10236ed8df2bc54",
    "signature": "0x7d41409d3e69465caf51cf24b747e28fa05606bbba66c7f566157aac4ed14c7019bff0b74e73e0bfaf46b96fe1c9db4e80a2b3ee47ad60a9dfc620c4128b2c4c1c",
    "signer": "0x79770FD07793ad1DfB304d64f0605418795fc311",
    "userId": "556468587"
  }
}