{
  "manageEntity": {
    "action": "Save",
    "entityId": "1781492901",
    "entityType": "Track",
    "nonce": "0xc9e4f3badef11db072fa2f8833fbdaaec0d77af8f7bcfbfe5a16cd49d76d5e41",
    "signature": "0x62effe535b1a637a8bdab898fefbb3fad0cad8e46b9852b73c672cf9fa9a55ca7d79a387952a8941c283cb008eed9e3e04e3a399b54cbc2c886a89328e0442681b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}