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 0x56d137e994e5146ce20a8c3abdcb078376f9be476b9143f248845f5a1ad7be74. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4b9a590-83cb-460d-b55b-69a7d8b70da3.json and https://artists.proofprofile.net/proofs/artist/d4b9a590-83cb-460d-b55b-69a7d8b70da3.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 0x44d9827438509fb653d003484f0464876388a74160b73943617c1a0006d9fa67. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USF277151503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e3dae50b69727037a755c21aa00ca8194e1f7eaecdc3fd17b869f584b3244b. 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/USF277151504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045d6c3f7c672701bd0689ae9101da562141feadd9396ac72530f7cc5e3c5660. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USF277151507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1ab6e84965f38a0a05170c73f00167a24d88614b053e6fb0c65bb9edb6fa57. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USF277151509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c8d7424e8dd96cae53a8c67dc850dc44b7d5bc6258884801eecf5177b07c87. 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/USF277151510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6789a99285bf7d27f09f91bb7f8bb73c0dbd570acb45e5bf48c80327bebfa3. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USF281556001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09830fe29cb0a47bc297199d9a8f934a550c8e5d1de510878111412fbe3efdd. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/USF281544002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb911bb755f16728ba3a551c95a0405e57b70876b5a3267bf9aee787f379aa2. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USF281544004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6378115f094c30fcdce596de1d485cc9759a43873e09ba1a9fc76514e83665. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/USF289801813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5882a90dcfa395ef0e6899e32cdff5e80b4af9797faedba4c49c66de61f2099e. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/USF289801819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92209a0af7ddcbe91be58c6d67ddeb334195042fce5be6ab6a23de1f5c1ac6b. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USF283088002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8767eab93dc879b975b00ab1fb59ff15d5558abda78f6c142b2ffc69504359a3. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USF283088001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91db74acc48c4e77e8ad27cc1f4c7c44852954fa07c58336e0430e84f92201c2. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USF283088004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6789a99285bf7d27f09f91bb7f8bb73c0dbd570acb45e5bf48c80327bebfa3. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USF281556001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6378115f094c30fcdce596de1d485cc9759a43873e09ba1a9fc76514e83665. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USF289801813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3efab331048db583fbebde197450a673923f24c9a81b95fbeac136c517f29e8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USF289801880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe9a770fe41609ed49fb0ec64a57b22a5f4330ef7e19f7ca6b66b075b1450f9. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/USF283116001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9881b737fd692bfac8619ae44746d285eb2d6862b7cc0757022ce059fb252026. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USF283116003.