1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1da7f106bbe4717f3cda5b1e462ffc6e4b0c0f57892e1f2af151825d541eda6. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d26b3eef-2cfd-4646-a0d5-f5d192092282.json and https://artists.proofprofile.net/proofs/artist/d26b3eef-2cfd-4646-a0d5-f5d192092282.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Najpiekniejsze Polskie Piosenki Pielgrzymkowe / The Most Beautiful Polish Pilgrimage Songs
Abba Ojcze - polskie piosenki pielgrzymkowe
Baw się z nami cz. 6 - Biesiada / Play With Us Pt. 6 - Polish Party Songs
Baw się z nami cz. 5 - Niezapomniane przeboje / Play With Us Pt. 5 - Unforgettable Hits
Baw się z nami cz. 4 - Niezapomniane przeboje / Play With Us Pt. 4 - Unforgettable Hits
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b49c078aa6163f49726d9a2509c1fa8e5779af4de10faee8a311c492b95d3c3. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA801994707.
Baw się z nami cz. 3 - Biesiada / Play With Us Pt. 3 - Polish Party Songs
Baw się z nami cz. 1 - Niezapomniane przeboje / Play With Us Pt. 1 - Unforgettable Hits
Baw się z nami cz. 7 - Ballady / Play With Us Pt. 7 - Ballads