{
  "manageEntity": {
    "action": "Save",
    "entityId": "1199702221",
    "entityType": "Track",
    "nonce": "0x5987d5cebdf55858c056fb70f2c215880c5aa225300032e37b33d3850a0e8ab9",
    "signature": "0xdca446cacc964ffb37dd6e40d2f15f6b8dbe63c0a64c0c99d5a7c5a78f4cab2d736b39e1804524434119ce532336e0d4876dc0f93237add74d5a2bf15bfd27621b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}