{
  "manageEntity": {
    "action": "Save",
    "entityId": "553748380",
    "entityType": "Track",
    "nonce": "0x666c1a5db879e22638ddd726065f9749f642cfd84a2ec132e660e500b8bb57e7",
    "signature": "0x05a762dfe927a63d797fe826017b7cf8b9cc9788d7a641634cd35cc8adedf3a118e4235fe2faaefd5e538b8a0bd408947c01efcf1a46cf02e6965686c40c20551c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}