{
  "manageEntity": {
    "action": "Save",
    "entityId": "668739",
    "entityType": "Track",
    "nonce": "0x4581d66d3ec51da581c709d5505c85856327cae3ee9b444b65f94ef2e9e8e8c6",
    "signature": "0x29b0a2c80c9141b66b4aefef0c4eaf559f2c27a4d29b0d91545f931485bd5bc33022df7b97e3a13bb711a85d9a6308c693107406cecdbd31107885e9832c0be81b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}