{
  "manageEntity": {
    "action": "Save",
    "entityId": "541321",
    "entityType": "Track",
    "nonce": "0xedb03f23c1a073b13a1f3533933843c5018837224ed3f92573cd07a97c68a02c",
    "signature": "0xc9406feaeee694761b9912d32acaae668daaf7078aa6f4ea78b1b2c6dcff53d03a16f412bd8e26a8ec93cf372a11336df2e12ded996f5cfb4b7972d6fdb9e54c1c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}