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 0x398bef9e44f4e340c0725dbca77cc9dd8d87a14f7905e976c7dfd42bbb36c7c0. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de38c496-c425-4612-8446-89ca79e3614e.json and https://artists.proofprofile.net/proofs/artist/de38c496-c425-4612-8446-89ca79e3614e.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 0x8cc3e796bc3f926a36d17fe5f3248bed07e15a489baaa3131759ce323ee6bdfa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWU2351877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f3048e25bea45d3ad55066a04708d257f8be9cecde21b16c3d197712ed7f5e. 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/QZNWU2351878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cbb5c955b462f3c528a914ea4196732e1295f3ea67b2d0090743291b06b807. 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/QZNWU2351879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79838053eee7ec511eaa9ec804614d45af121125b4f3980a909c40ea026fcac0. 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/FR9W12307521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d7281b780cef45b0c310dbd924611b07c57f9b3501ab271ed19ffb1ee74f0d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/US38Y2413677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a44884c75d8bb783470cc275e0eb6b62c9722dec448b424337dcd4e28f6a50. 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/QZDA82486444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1098952e37e4b3150d27e34ec056cc2883c5d243003a7ef393830d40ddb22d6e. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZDA82486445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed1a88cbc3509ab8d6badcf1f838a7605edb3c2b36d1e709b90cb298c6a9580. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZDA82486446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f4c8104e75eda07ccaed67caf5e93a525017bfdef128be3063400c429fac3e. 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/QZTAZ2325322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d66e03b32967fb7a357b623600e91d826351db8d17a7e98d88e398f1eb3ac03. 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/QZTAZ2325323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041619084b9ee6606eced0ea15e847400bd4a576332b852d6f0a4f6b45dca45c. 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/QZTAZ2325324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5027aef5fc9f9e60603ed5707fbea825aad2e3a135b998412ad26254072f95e8. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZTAZ2325325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed75b43fbba3fe097912418d819abcdc3deaa790036387bd21acf2a587788c7. 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/QZTAZ2325326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe033a834014f6f96be15512cb1a4c2d0358a5d63a0def5d04be1878b1d9fdc57. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZTAZ2325327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76c51cbe04bd0655daab3f53673c003cbb89c64a406a771565c3875ce20b7c3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTAS2369202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79838053eee7ec511eaa9ec804614d45af121125b4f3980a909c40ea026fcac0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR9W12307521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227739711949732bc19491d8006b0e1a30df212dd01ab00e9af15496f0b0d10a. 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/US38Y2417392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca86897a8c472bb0a67360ba252d93b5e1a829084560e6c59366d4be31c217a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US38Y2417396.