{
  "manageEntity": {
    "action": "Save",
    "entityId": "1957219819",
    "entityType": "Track",
    "nonce": "0x3b7874b414e2ae0b4550190e352b4cafd5e9c590089cfb184d05e89978150563",
    "signature": "0x15648d31335951b0c14d01714d5f3e2e2e2bfa09bbc8d132f6dbfe17088b26c24b420e9673ad6d0657bd7559bd79f430305a45cd5c73d3a73c1953967c9d8eeb1c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}