{
  "manageEntity": {
    "action": "Save",
    "entityId": "1843396014",
    "entityType": "Track",
    "nonce": "0x2e3491b10f9871d4c9723020189e3168407903136dc5fdd5a91a9a6545ba8082",
    "signature": "0xe719445d901e2a0969e26cb97196489c10afc9028927d4c90fdbdb4164959a1f70823fde474d3eabd48d95cb2074bb82e971445de6bce2222ce28150421ff15f1c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}