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 0x9da4f341fb6d6861327ec65afe9739213035bf60f67e64337ffd54a32be30528. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/841985bc-220a-4f6c-840e-2cd510e43dd2.json and https://artists.proofprofile.net/proofs/artist/841985bc-220a-4f6c-840e-2cd510e43dd2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brothers in Freedom (A tribute to Ukraine from Sweden)
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 0x9be00e87c2b9dc3fc0cc2fb4e379342f86af4e33d6d57ec852de8eb12d9432ab. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7N2559975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eedd2fabfae046aa186e90aec91686ca0f5df4b49bd670ef30d506b474835fe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ7Q2536509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecaf819ff7b392e1f959f2fd3abf4356692bc5a3e80d7a414370ee94819c6993. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3F42508256.
En man med stort hjärta (En hyllning till pappa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea52867a985d517a8e04551b3eaa800da27dda1ce34c4b2073c4d13f82032fe3. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT3F82576782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ce12469f5d7397a7b118644e9a810c7b7cbf1e7964c05943d095eb0bd42fed. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3F82576786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c990c7c265676ba68543d196dba127aefbaa75a6c5f146cdbe3f96a8eff645d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FE2516905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac90cb6d25bd3638db0792c812d7efb2c5eec9bc081a8bee6f21517f10c2710. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3FE2516906.
Guardians of Sweden (A Tribute to The Swedish Armed Forces)
Behind the Badge (A Tribute to the Swedish Police)