{
  "manageEntity": {
    "action": "Save",
    "entityId": "425124083",
    "entityType": "Track",
    "nonce": "0xcd207132e1fd18b91422da61d924985305d721ed58a64cafdd3fd5af65dc1ccc",
    "signature": "0xc2e978cca1320e3981f5914bf9d1c3866f2d095cb9393e279056c515a34728f730df90b497a9f4519e6732c37d45ef4dbfe2470fb4da5d858b7d631ee376961a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}