{
  "manageEntity": {
    "action": "Save",
    "entityId": "1466492199",
    "entityType": "Track",
    "nonce": "0x1a1cb3ffa425f35da3a4d6bba596ae67ccbe001d1aa6cb6673af3b905d7c89b4",
    "signature": "0xf4bade3100f9e742c22ade0bbcead4c4b365ae129442b29e6bd4b9f5776997ac0515ff4170cdee123c66c0111d5f9605a821447ebb0a678b7d5c4a6d73afa3e51b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}