{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573164525",
    "entityType": "Track",
    "nonce": "0xd4db894767a140b677df7307a3dd076def59506ed5c32cee32238d4c253ea951",
    "signature": "0xa2222dce0a283e943ed49d89d25c408717e44542ff0b56f1f85dd6265b0959502b7d5ae784294f6867d7278a26c625d029a766892a7d287f230f620e48e1df3e1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}