{
  "manageEntity": {
    "action": "Save",
    "entityId": "476331993",
    "entityType": "Track",
    "nonce": "0x052251c914dbaff7ddd55a20389d6d2181c30d74ddabd4f0a9334284e4e3f963",
    "signature": "0xd3c12a626ad798a9419ae64480920634a1d8f1d96eddcde6961152b42010caaf1792a32fa9e730878bb1fac293879c5248e013947b04343319ca7426c7af5f4b1c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}