{
  "manageEntity": {
    "action": "Save",
    "entityId": "145644763",
    "entityType": "Track",
    "nonce": "0xa4cc36c741b92e2cdd85b12ce789386bb040ae6c78f4b8e33be6082c7fb377c5",
    "signature": "0x9e4db0114290531e1dc42a39ef501efb9f563fc803d2bebc7142520cdfc1183907e7756cc52da43924e557336213fac17ae4524d39fca0641db535c90f03ce021c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}