{
  "manageEntity": {
    "action": "Save",
    "entityId": "709803249",
    "entityType": "Track",
    "nonce": "0x48cfedac6b591ea771f943bddd47faba610acfc3a9726cf9c44305412e6b89db",
    "signature": "0x6558792b79797c61742d3c40ce1f851c5e44bf5599181ced398ad67d944c95f4567c54b1f1cca25ec9d49fbd7e444cd3b486a9de82e1d706f5179b3bec68be781c",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}