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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16903347be0aa4193fa4a833e6508e4da0bd227c0d29c8d15775301fb594d7b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d5354e7-8b4d-4845-9510-dbd0c8d3c60d.json and https://artists.proofprofile.net/proofs/artist/6d5354e7-8b4d-4845-9510-dbd0c8d3c60d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Thibaut De Champagne: Seignor, Sachies, Qui or Ne S'En Ira / Guiot De Dijon: Chanterai Por Mon Corage (Crusaders)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5539c1ca9a57a5235244cd7b573c3c98cfecc570f3762de88daa32cd398e4ec7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEB909600901.
Seignor, sachies, qui or ne s'en ira (chanson de croisade)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c3a725d4c5ea330e88a76eb770be98db96a8c8548765a8e600479416ff6753. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEB909600902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95be10fd585072e13d73528721397c0c407ad8871800189d0fc212ec8699a225. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEB909600903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cc8fd755d14da1be30cfeac9d0334809827b6af323931e537574bd8e66ff9d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB909600906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa0f713a4f8d1560ab97592c9d261696c117e2f49c6ea96859fe480c9cd410f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB909600907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708b66f6d56d3caa7d454d7e9dc70d3696d793413a5c21e315605fdd64f8e0f3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB909600908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b1dcdf3410783c0996add5a55f5903b99a98ac4e7aa97f2f19c206c2d99ead. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB909600909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7041c8b1902eb5cb4611d1f1ebca85fd31987a9b9d208a157fa1dff919631a9a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB909600910.
Nu alrest leb ich mir werde, "Palastinalied"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2455e41ba637fefb33ee78587ff1c69ca6ab3b30c7f3392420a075a3e1221a12. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEB909600911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a276f248f49bae245c915ef770daa0ca5ad113b6a78c24b9a2180524f6be7b2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEB909600912.
PaweŁ Łukaszewski: Musica Sacra 10, Requiem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7a1677e01aa019baba0489b53a84ec6027a5df0ae7d6d77c0bc0a659bc31eb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/PLA162484502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf407f2b7f7a9ede0ec9e85d9ab7789a18d082e0f173df09525105d6ab0bd699. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLA162484507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf275e8d0b52481a3cdcacd7656908ba886246115aea9bc673c68d8bd1acb88. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLA162484501.
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 0x5319659031c706f9a19c9683b001c9c11673964f2417dc055e0d3b2d54bdc03a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLA162484503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfef7b65a2b451f8d00b0cff30623e1c6dbddd5837080bbdc6929352f13f8e5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLA162484506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402c693ba05c1080c5cae627b2d17c67fd425c4efe1d7af444617575aee87994. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/PLA162484509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786787c7318af9d70f7206f73fa10b4196454949dbc5e62fb8ac0ad6cc95f743. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PLA162484510.