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 0x39e946e178b68da2a6714a1a24170226b7431ec77059e2fd189cd7bcbecb7ae1. 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/24a0a2a2-5de4-4864-8969-0235d195c659.json and https://artists.proofprofile.net/proofs/artist/24a0a2a2-5de4-4864-8969-0235d195c659.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 0x2b9ddd3b5a68f34c1cd04eb696370bdc3e3f1ac688d2197b207f54ee06e7b8ae. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCADT1859723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd70245fa57f3db61c74664a9c0ff4fe7e41bb01e1ddc9439f2d8ca52ee3b67. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAEQ2097645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36df829457c876ab689f595c6ee7675c20d63285f5fe4712c48b72e31deaf0c3. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAEX2019755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e623e08c313ceeebd5c673ad6c1d1cd8548c5f5dfa071c07ab2a86abadd56cf. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/TCAHA2392228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dc39f0c99164856d27d98494d43350fb0ba9cdba17aed39e7f7257a11f6b1e. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/TCAIP2405649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbda86d6c2a809a6ca6d486712993b16fe946b445429df45fe30a0bbdbbb682. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAJF2540615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d694bbb68e5c1a001a3f0e73da121c4a877345c6403d147a7ab42cb571b7ad. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAJH2515504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1543d9eb770f2c3d882abda2399350b1254e48033274ed648ea1a840956e3985. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJY2540113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96875ce021a6166d46e373714bdd0df090c976a8278fb42a20e406e926273ae. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJY2540062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdf03e45035248b0375f1de5ff07e151d5a9b314d117a8cbc5de8ba4505627c. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZHN42077952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a81a1c5770a2a9562c8f1e76b7cb8755c0d91ff3403c2eb5964ad425ca668df. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TCAGK2266431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1945ee30247deafed0e0de94825ff783a3cfca511de07cb5cb09d21a0088eee. 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/TCAEK1969583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcb425108650647be1eb2acaa8d8dee035af9504dad4b33da16da6bae32572a. 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/TCAFH2099520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9b827bed81b4655139b2a97b19ed7d3bb9d411123e9778e89848afd6f3ea07. 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/TCAEO1933918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcffada80b948f7b1e4ca413a01972aa8a9ce51cb3169a235c2f95a220a7ce7. 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/TCAFH2092941.