{
  "manageEntity": {
    "action": "Save",
    "entityId": "630744393",
    "entityType": "Track",
    "nonce": "0xb793c11058662c1dc739f6a94a03b723b96f152b263a0f5888bfc901d352a1e6",
    "signature": "0x6c0764a22679f9f5925979cfa470138de0594b99d042843e45ae7c8199f2a37d3a1a145edb82d97813c2ee6a1fcc6051a0bd8f658419981acf2c6631486e87461b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}