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 0xa19121e95a33fcfc684b876ed637e193d8e75c054cbd75bc5b2386db4a15696e. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8610347-7aee-49b4-bb31-d9de39e4c2e2.json and https://artists.proofprofile.net/proofs/artist/f8610347-7aee-49b4-bb31-d9de39e4c2e2.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 0x48df5b676cfd05c939f63ac983b4fdbbe1d586ee7369eb50e129d50c677831d1. 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/TCAFA2015120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353aa554f08f87b09bbe7f4a228b36b38e857ac69e544a791c051e0630b60211. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCAFA2015124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa5145c7990d43461430e797896d84741ceda2f45acde685daa3703f8ac93b6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8211773f48ddbc84ec8fdbc622492654ec35bc6fcac5acb5c283abeb1c414cd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c8b7b8dc86d5d9d3584145aa1e56ee775500ecd6f362493c8d3e8792ad2f29. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33cdb78989bda74341db9776aae01dab47f437c3d780db3b80ac3b0b9ce8651. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAFA2015134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06a10f2b6a5b4d4227ba82238892185d8f383a9e38484309b0356cd8d582529. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAFA2015136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92c9914a32ca0d5a2301b52b0ec00ae71109a6975a195591ad0ce025cec449f. 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/TCAFA2015139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9b0813cc9ea08de4eff77a03786b2a141c44b4733232410db0ca5b5d837dc1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01f4e3ebdbbf7df5caa1affd4a065a05c8d8a3d361743a2bb056b28ee14f015. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/TCAFA2015143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9daa5297cf9bbaf4e433dec15f7673a7d95f8eb3f7db48dbf7e0f610b6be7e8. 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/TCAFA2015146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a87b698faf2dd08e8ffa7c3e5e4dfa4c6592d0fa10c835ebcc24228b79eaf5e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3c318cbc93d76c0f5496cbcb7b4befce13d9e4b99403053b4d206f1a3fb7d3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376e448d1beb92188deb8258e22c9baa43cc8943722e33263f1c42b9b000ac8a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAFA2015155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ad8bf8a2b869c5cc1ef59b80b9986ea6ff7032b09f947e55f33b0ebd067d52. 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/TCAFA2015159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad18fd9923bdb7cb6a64d95a77ff9e6a7f44f9ab9f28d50405873c5d5845249f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1ed5cc0c9c5260d52d3cedf33998b396a1c245fdbb55ea762a5471ec5bf05f. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TCAFA2015163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc412f55abff0cb1cb5e6654b37d1ec854ec1650c020bd586514e511c8ab111cc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cecddd7da319cedfa897cc8290b81f9ec4e477d7b35964a1db2955e5b99bf5a. 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/TCAFA2015168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce145adb9bb82f6235ac739289db2e760cccaf199fc80e88fb34f9c79086d307. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAFA2015171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5823684f76f7bc9a151bdb1ecf2f4316ff1109a68da269dcb8352779385c00. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFA2015174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e79c917b1c101d104a03bc3704db8f342bbefabb179b413ca3f7d350b5632e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAFA2015175.