{
  "manageEntity": {
    "action": "Save",
    "entityId": "864984833",
    "entityType": "Track",
    "nonce": "0x3a2a341bd8b8adaab570e1a33b911422a68cb6e7390135b865d576e457c058b9",
    "signature": "0xe2cc3c3a5cf73c0ebd6235a212d1ba7bc9c5f7d131d3ec7a3057e8c3d6e767830a1c2e214f5a29b92a607a11583439030298569db203210027e59927edd5bcff1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}