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 0x28a96e5f830515e2f6e794aa9deef068d480a87740e79710bd6210463e9e4428. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79519ff2-1abf-4aaa-a7b6-b96371f25039.json and https://artists.proofprofile.net/proofs/artist/79519ff2-1abf-4aaa-a7b6-b96371f25039.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 0x145eedb1e2e5a8956205b4ef8535fc2fa89cfefe6278aae4c2a14094f19ceb6c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBHLW2201796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c37635d48535d4b6092c6681113e353b18aed6e87271a4d467abe249105f577. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/GBHLW2201797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9e1c0186c068b6a8f7153ca477c7552a874679f23ff4959ad5036d09fb0e10. 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/GBHLW2201798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69220a8726a38c3d6d81099721477585fa610a9d7ae935f21184ca3da8605773. 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/GBHLW2201799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b06def133ca0a46f4af5038ec06e315f5561059b89b609a475ac54ae95f5629. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBHLW2201800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbdd1fb85da6a5a1260ec5391e19e01854ded9bfab4690552a63763841cfeb3. 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/GBHLW2201801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4762e34f92c22f81d9033796320df9a504a460a15c27ca156f2cee9556cbfb42. 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/GBHLW2201802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34d91e1e30a26189b1c69547fd483517274743f887883b2e1a54639cd0205c8. 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/GBHLW2201803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a413489b71f4f66efb8e123a474c37df6908ad9c4608e2a315712c6afe2e44e. 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/US4KC1166901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a91457112e9a96eb74dcbdb20359cf1765daf54a42d1214fc31572f7e33ed06. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US4KC1166902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b81f6f4d078b32d8bb6d3c86aaa87fb9552f6f358fad12e972e2d0673a6bd41. 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/US4KC1166903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad39b5f7185e52ea61cb15ef502ca477dcc8deee0edabc51ecfe084e64a1ef0e. 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/US4KC1166904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79fe76bc09f7e2d144007bcef93c1f19bb10b1c3c7aece3f1198a123cb6ec47. 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/US4KC1166905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cd03404fc4b0141edb14292f22c9a9bfaab03e1bd4c7c97dfe3fe3ea676ac1. 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/US4KC1166906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e10caf2d842d7701ebcb36353a340c636331d5ef1cf535f3db70513f7e0ee0. 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/US4KC1166907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c0e1b7a480b9fb6203c62ca52a3b430f9d94c21968665cecd2a3dcf5fc4d6f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/US4KC1166908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8df9639401f805a56a23791af985724fef56c2c338e92f1f5cfa8d3033abf6. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/US4KC1184401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b047de734239e8b3ef96198030cd4cc2f6ca613e2912e4461a060fb3bab2210. 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/US4KC1184402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ca11656ee330652bb504a1930ec8756b6e3a2bffc86df57c54a4c57abdeb75. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/US4KC1178901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae70e48e29a532f49aaf471c14936edec0ebb58518cdacdad21c771dcb7a317. 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/US4KC1178902.