{
  "manageEntity": {
    "action": "Save",
    "entityId": "578914561",
    "entityType": "Track",
    "nonce": "0x4fb6e62b365ba78734866321241f25e237a28cbea454eaa461cf81428e0be599",
    "signature": "0x83a71707b2229f155c2eb31ae19e43ac230e1e13f94fa1def654168408d4125416bb1f97921eac4485fe3e2f271f73935cf86aba8e57b4ce694f91acb071522b1c",
    "signer": "0x48c57b64a5a12Dc7C7742Fdb629EEce52FF5591D",
    "userId": "930634116"
  }
}