thumb|The French prince du sang Louis II de Bourbon with his son. He was a great warrior and a rebel. He triumphed at the battle of Rocroi against the Habsburgs and saved the kingdom of his cousin Lou
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 0xe9def03fdae54cc4dd0875740149de1a397852ab837dbb4c664bf94f9ad2b9e0. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c285a17f-3f8f-4153-b2c7-ea1be02374f1.json and https://artists.proofprofile.net/proofs/artist/c285a17f-3f8f-4153-b2c7-ea1be02374f1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xe5e25a2f497f9cd6a3eff70aa2d6ee6f1d8b8eecefe131ca658be1f7b742ab91. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN42321216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6d62ecc71a6667715fea9e7fdde78805bcbe22f1792ec7bb4ed83f043de65b. 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/QZK6N2362881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56dd2da0f033d602aa8cde2662b6cea0cb54954dcf75c8607f0221076700c9d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2378997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e25a2f497f9cd6a3eff70aa2d6ee6f1d8b8eecefe131ca658be1f7b742ab91. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN42321216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238cf7fc0ad00ae067dc3ef864b8c4f4f6fa6170a561c3940d3e54e68dc45cad. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2378998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73652492bb80d1092cd6aa759be1a378b8ae2ba5b7537e87d63fb41713fbd3b5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2378999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15a3ededa5e2a8db14bec52e08a629ae03a5674a4c8e265e40848b786ea9f31. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2379000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfbb7d6f2f4c081ab83554d43411f06e2f99734be32a87e08d0ec311ff4fc38. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2379001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02f45a32cac3bcbc7fcb9dd6bac812c83b758ac46d9ec956f15b13bf17330d8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2379002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe949ac8ccd4e2b6c2877efee0b36032c2627f7a9d26eb4b63c90b2c77b356ae3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMER2379003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6d62ecc71a6667715fea9e7fdde78805bcbe22f1792ec7bb4ed83f043de65b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6N2362881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb210bc4db9b92bc2fc296c4e20849042d95e5465353a53903fca557160318b. 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/QZMER2379004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5674d965b774620c7b7cad989be6c1cbf22710af65015d6a364c253d19ce3d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2379005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7499dd77f6b06c64075d982b35f0da8062265dda0b8a4d84770f146e37d7ca96. 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/QZMER2379006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df4a2eb7f88878adbd9c89a5d4ca77eeaee8a33ca95379461ef888fc6dc5487. 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/QZMER2379007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd69d0078aacbb19898189f1f48af56f8f760b3148b0a3e9bab4756e84dee52. 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/QZMER2379008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb976a928c4a3c10ffeb01a4db3ccd3604183b70cef6b801b4445b85cd4a91b8c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMER2379009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe74ee8f3ccbe919483de8436ca243a02f58377767ded1a66fac222f0c39dd3. 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/QZMER2379010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b19411c1ede40ba68286def9f668101fd18bd6380e9e5a4552b65b440de984. 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/QZTAT2422310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd590f3b713ea662ca8c2cb5d47b8ded5e66027c7b771a0db0585cfa73f9982b3. 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/QZTAT2424403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b581f5c78a8bfb34871115402bee2da42266d92fe18a796a67f836a3bdb151. 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/QZPLR2204363.