{
  "manageEntity": {
    "action": "Save",
    "entityId": "573130",
    "entityType": "Track",
    "nonce": "0x2271ddad66d061e31e993cf6dde72a0a69a41c13cb5fe842e5f29b23037f443c",
    "signature": "0xb42f5e9cf4c6a1dd1ebbd0a236c35466aaea5a44f42ad273a5cf4f850e6044fc438099937b3368f405e12e979bd642bd65e7151be8ab628ff6e809462315ea811b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}