{
  "manageEntity": {
    "action": "Save",
    "entityId": "452257112",
    "entityType": "Track",
    "nonce": "0x570db9245aba46dbf6132498f24a3830d3bc18cea853c3a6a322ea6cbfe8f2e6",
    "signature": "0x790c7bfb86da4a16de5c5cd248741b893c15859c07e3d20863fe8bf10f111b2155b595a5e52914a996e77c5888315b3a3267948bb090a6630557c976f4f795691c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}