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 0x9ca23bf41c22070d368a7f0a5b81792b7db9e5e88307f3dc85381571458c4981. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5e924dc-9a40-4bde-8aa5-35eb681b0d1b.json and https://artists.proofprofile.net/proofs/artist/a5e924dc-9a40-4bde-8aa5-35eb681b0d1b.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 0x3e4a5513dc4f47fb2a21a3d0def72a308c53e332049aeed193a93cd447fe57fd. 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/QMFME1987000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ac737e8a20e7a34b93d6877eca4de626140ac97fcdc53b242ad4a427eaf2c4. 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/QMFME1987001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180fa8b6d1a560042f5c432686d991031c81c94adb6a121425127c16a93524dd. 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/QMFME1987002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d138ec40be1c86a8e9bc915717d38aa54b749b76d4692d374b73556c11d105a. 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/QMFME1987003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9030766379c7c53a69c62d38fdecac2b0d3a80ff3897163c3f1f4803e0bf146c. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QMFME1987004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf711c6c16c9dc0c356c4dc7c0dfe53adadf0245b95cffde465fcb5fd1d6ddc. 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/QMFME1987005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a154e8089041680bb99a9c5a5cd79a7272e1025ee4997b9fd1e6b24aa7e3c5. 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/QMFME1987006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb6dfbabc52715d698448acb294ea1d89a57a61edb6fbf0edb9c6c0f21fcdfd. 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/QMFME1987007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c1feb853bc220ef82d0e8be230a57d96ffb7053b2ceb4e2a91d6d2c9eeb029. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QMFME1987008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5cd1d3993493cf6edb02997e26266c01ef54460c9aff018e1cd01f1a3d1820. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QMFME1987009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58db7b1c2c936c037dc547acc70bafb66695a441055b972bd6a493e1c088ccf4. 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/QMFME1987010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa008f48d464ece4b8d3b9a6dbcd3957c60300fabe7c5ee2b73f752eeb687b219. 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/QMFME1987012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6703b919c46a849535fb3031fb8cc743924b6f7caae8eaae36552b70cf8aee02. 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/QMFME1987013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e066262d013a8d213a54e774cbd08d039a9d2639dea910b5abd313b140102f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QMFME1987014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c50055c275a758e3ab41c674a6c18bd03828245a60edb97e0b6a40e9f59e2bb. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QMFME1987015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1e90dc25a6adacdf85826954e92bf34f7c297611b9641081d370306476416d. 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/QMFME1987016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ff17497194cad2974866235325a85cc79e6e9a36f60a38ba4690cd9138d015. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QMFME1987017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257c795ea2445dc872d98c1c75c7e3808c91c6abb3aced66516ffadd0d10b1de. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QMFME1987018.