{
  "manageEntity": {
    "action": "Save",
    "entityId": "1218729140",
    "entityType": "Track",
    "nonce": "0x0819975cc9afc3ad208c6883f2aab996cecac1b7ec39a3cf1fde62d2733ce2b1",
    "signature": "0x0d6b5e35df1c4a7e007894994c368c00617f8c664d1a0a857783ee2385c0e57e66571350d00bb480b0b6d3f2abf3d8c07e1a4494aeab067fe52207a77906f54f1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}