{
  "manageEntity": {
    "action": "Save",
    "entityId": "703878",
    "entityType": "Track",
    "nonce": "0xdb28784dde6822cefb7fbd240b2bdb8180a96b5f43d3db04d47901d5310c5a73",
    "signature": "0x1e56234fbbe73a61060744433eaacb46206bd5b22416c7ada3f1454c61d0e7641889635c13df92b05995f93e18abb03c0bb52b191951a8abd3a75cac7203b3431b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}