{
  "manageEntity": {
    "action": "Save",
    "entityId": "1423877711",
    "entityType": "Track",
    "nonce": "0xd94c9c709d58e415dfc23387517e2620335d8c9fa81a4ddd0db55b9816888e3b",
    "signature": "0x45dac4cbe52def47381480160ec0a1591ae9c5848f0e23babc73f767ccf476e609d678db75fc0f2bd82b9cf0ae5b39f056c6f29e52409e9b299618b71c878cd21b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}