{
  "manageEntity": {
    "action": "Save",
    "entityId": "1975964751",
    "entityType": "Track",
    "nonce": "0x50c87a0fae9a44547b03bd5a77ba0b89263b307f27e26699abbd2504a4e3a634",
    "signature": "0x0787ee6b3e2119a3137f15e657ad9d22ac785bd81d39b251eae052d53eab7a0917f60ab31e2027f61a2d2e3a689a67e82626965db00698fe1613d10a3bbfd1451b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}