{
  "manageEntity": {
    "action": "Save",
    "entityId": "212553088",
    "entityType": "Track",
    "nonce": "0x7cfbcc5f0507189fae7a8857b70b2746650911ea30bc7176c140875fe683890a",
    "signature": "0xcf166d95715e059ad188e8a25b87d632224fc996d34f65a342320eafce778e142da26175db5e4c51fbbf4379b06d2efb5a1ccf3c96c419aa4124d5a5ff4c34951b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}