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 0x296cb4c681e96536f34b8be6ff772feab7e6ff941d7ef59b087b1b51e808c095. 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/1f3d552a-02bb-4f9b-90c9-9ccdaa1078a8.json and https://artists.proofprofile.net/proofs/artist/1f3d552a-02bb-4f9b-90c9-9ccdaa1078a8.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 0x84e346acbb6cd26a30b57cbb4a7f58067a9abb5d698e147b31da30b3cbb410fe. 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/BRAFH1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1df000fa0856f4ae791d93751ba46c003fc93edccd52ce3e59ccded533cb503. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BRAFH1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978570d04f25197e6931703e0a6b8b225136c7f91eae2c401bc84d7aacc72881. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRAFH1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab96f5ef090aeadf0f54ca5ddbcbb6f6543dbfde54f8c21a10e7d9e0ce95fb2. 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/BRAFH1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fe93e3ae9c0e7fb6a40a127b776dbb01e64902b1673863adc5a416aaf011cc. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BRAFH1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf536fc906d5126d6d81e51c708f28c7e941ea833da70d443b6c6b9552acd8e30. 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/BRAFH1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f0c2d2156029f9780b32a2f7a813c5aaf57ac8796f6f8995440bcc0db4a2c3. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/BRAFH1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c67da70d60e6f477c8cb90c56f8e22e96a4cec8a8b44e8bfcdf4c3d03d7693. 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/BRAFH1300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12c743bfd12162c92abc101b67ed7df3cfd6a9aaa501d67ada921206bb109c1. 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/BRZ9C2000586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e397353ac75979241a531cc8cc1eb8cb053d776ebf936b989e278aecf10b3c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BRAFH1100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71609d8557ddedfdebfe1ae29854f85a62ee4630cef1078319a67c8caeb740e1. 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/BRAFH1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5832e4c8cbe48cc8e2461174e5f7316224b3cdb1c0fee665b83f6ee201fad946. 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/BRAFH1100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad04f8074d6be32a1b115a184db420049cc448dbef30dfe38d428ddb022dff89. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/BRAFH1100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86128e023d24c3db2c98e793f52690576771f2fe0b67a6e2f5ef53f823d512bd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRAFH1100005.