{
  "manageEntity": {
    "action": "Save",
    "entityId": "743684852",
    "entityType": "Track",
    "nonce": "0x1710a8b6a7d3805d85c34924ada77a5d49c5856efa602e56eeef62fb0177f299",
    "signature": "0x3479abac887d82a66f0658fa5468fb173dfd60c5fd71f84b1302355f8b9fa6d33a729f7e06494f5485d1d22d450063e11d78bbc6aaf7c8990072213a7ffb89451c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}