{
  "manageEntity": {
    "action": "Save",
    "entityId": "1045120361",
    "entityType": "Track",
    "nonce": "0xef8e1cde53a98d5fa9703460d7bf782a1453013a4eba86f94667dbaea5340571",
    "signature": "0xa3b4e0b8afa2f5fcdc0881ec43237824d4250736b8c946a1621182d945cb758e7d3b88a08939048e3e43b2629210e567253a373fa27291efc5d88b306f4f31e71b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}