{
  "manageEntity": {
    "action": "Save",
    "entityId": "218047410",
    "entityType": "Track",
    "nonce": "0x777f174e0bf3f64d4d3b5fca85949b7087989dcb1682188373218fc7f9fed5c9",
    "signature": "0x4c3e5c5337ca1060fb7fa2b90f90d9747fd09a197063e795767f8057d2a835383689293812c21ca0a3050184c179829f794b6c2e2f6b2f6bf3df1392db3b1d451b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}