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 0xa325581df5f4bbb6fdb42fe28aafe7126c1a70995d2ffe9eec292278f7b67931. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/195e3018-4578-4195-a83c-889d0532b529.json and https://artists.proofprofile.net/proofs/artist/195e3018-4578-4195-a83c-889d0532b529.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 0x128e6e8ec08110d24e8eb1a2a73ef5cdff0c3bfc7eed7dec4665191bfa055929. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHN92124957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fd721e2775da99addcdde159b0f76c379be401f6dc87761da64747541e90da. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/GX53U2014801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121bfc93556a56bc957b437bd1711b83da1bca378130638cb0a96d2524f9c42f. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZK6J2298326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00395d3319e789a5886b28e269e1f03c13074c1af0bbee6b4adee0f4af8eff80. 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/GX3Q92347577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428c7d371e3c24456261ee95892b054cceaa025191e4099ab62b35f3491308c9. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/GBLFP2344446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2b938eee421969bafc74a99bf784f474c66628d102c5f5ea9fef9d3c409ffd. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZFYY2454459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8907d7fca331b8364d1a9bb18b50aa701a67fbe46a61889bf8bb46dc8d4e7fc6. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZFYY2454460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8af93886927775a61725e299778faa32f8830b02da338a9dabc83e183e7536a. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZFYY2454463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5191110ee688758782543cf68cdbbb1b0048d614f30bc0fa475e68507972aa. 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/QZGLM2446577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c57c3e3aa28c402ca3f975ddc53105584a75a35f21d6d128b086abb8cab943e. 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/QZGLM2446579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6a0a1847bc16c0f31a19186c6d47970355360b9c03cbf0403c951d2f32e103. 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/QZGLM2446580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25f54aef5ec5e8c4b016722e7794732aa40365e783765b1ac5f2695372a4be9. 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/QZGLM2446581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b835a7d02f38b85186c2626e5f5a523233f926d825465aeee0e1886c92f1df0. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZGLM2446582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f0916002a3c5751ad7c72efe501e5b03e7e9805fa5ec2ae49bd6be21c2b48b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZGLM2446584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35bd1faa4a9591c8d56fa53d06771247bda5fd4c441bbedf94dccd833211fbe. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZRP52422434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bbb4331e1a914c58c489fec6128e83b675cee7b3fc235c842ade2f9152fc4d. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZMZ92552563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07b3ec47019345daecd7ccef497c80423c820c915e8e8883fb384989e7e8ce0. 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/QZWDE2407583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a88f6c7cb49456d12ba5cac99c3256828c36d6a2eef82445b2e720a1fe0df66. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZTVM2342216.