{
  "manageEntity": {
    "action": "Save",
    "entityId": "418764875",
    "entityType": "Track",
    "nonce": "0xc20774737257bdeaf5cd0c3d8617f53ea4ad475781ac7cf51e8215e545df4660",
    "signature": "0x43ec991799d432517a71b2c440adf31dd92b25e8357e340691d3344c02b2fa424e5afd8099e3e06db9b4e6e6a49554cdb0ce4da2e6b68a87032aec7096df3f7c1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}