{
  "manageEntity": {
    "action": "Save",
    "entityId": "1405371658",
    "entityType": "Track",
    "nonce": "0xc2e3eb92968b3169349f18664b175478e6c088838943e907e9c1f1ab1e400d2b",
    "signature": "0x15faea1d944d44a3072c3029f3ac824c3a6bd850459aa97a89d987c419c466905521c1edd09ecaedb1b189fa11c6844d3cf1b7ecb073508d913a67f9481f28541c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}