{
  "manageEntity": {
    "action": "Save",
    "entityId": "319912500",
    "entityType": "Track",
    "nonce": "0x7e175d4c5393bb7e603ecd77285f13307b122530558bc71cbde24f814bff506a",
    "signature": "0xf3d631bbd3859f51096a67e02b42de9dbf6224510625836e10d2d3c6ea38bebb1e51924cefdc62ff06041d249f8233fa6592bfa9f5d85adb728dedcacb4e65fa1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}