{
  "manageEntity": {
    "action": "Save",
    "entityId": "1539774177",
    "entityType": "Track",
    "nonce": "0x601004b08b43f29eda9d4b8f5fcc82b7a5cbd0b94866c9d71d3e8d00bdef6beb",
    "signature": "0x36ced893f73319fd9198ce0583d26f8c0e6139f586553e2b017f0bd6717742f43bd996fb2442263da903997cd4a38de3ed1c3e2cea6a2d128e28a115c8dcd4931b",
    "signer": "0xC2128703227276e4621dB635cBE2aAe1Ccd7fEA6",
    "userId": "747927961"
  }
}