{
  "manageEntity": {
    "action": "Save",
    "entityId": "74902",
    "entityType": "Track",
    "nonce": "0xde206965cb10be8b583e2d7677921fa23a8c76235d6b3b71c45420d5f1ed0e7d",
    "signature": "0x4b9e20af4962808f97a7c022ad27ef5b8b8d3579f7c2d6f421f0437d43061dde381a07938d5db5a783917cbf1b08e561f1fe53f8a1541851b5b25975f0f724081c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}