{
  "manageEntity": {
    "action": "Save",
    "entityId": "518096",
    "entityType": "Track",
    "nonce": "0x0604deb60d804fbcbccde6d467f6b3afb2b4c75567f8c2d0839d3e70349f4606",
    "signature": "0xcb1d9543381c05b4ccda83720fe96035960895fd4cc9a3947c3f221eb2bf89a3152f7e0131ed0e4d6a7eb0ac40a9c862f85d0b3825f35e196a91e78ba42dd3dc1b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}