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 0xec4dee42d865713da85227da5b0072f067b9710f9b50b713f6147ef49954c549. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3b1bcf2-da5c-4340-9544-3ab00a20098c.json and https://artists.proofprofile.net/proofs/artist/b3b1bcf2-da5c-4340-9544-3ab00a20098c.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 0x61eeae2a76708e38cc4078d7887eed5baa34a28889b2099cd043e0535fc6125e. 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/GBWUL2201581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0271137aacaff8fa3e8ed9eee1d49e40c0d0454996c02424cec6cdf04a82a1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:37:32Z), 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/GBWUL2201582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643876534e144d74a69a6197ab94be652064c6e9611c30fc6b3084bac5494a16. 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/GBWUL2214198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f6ce700f75426b12d29dd7fa4c934e940e8bf2e8f6d4b6fcf1405f9affd873. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AEA2T2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd790005bb543a72a45880ef7ad4a44f50cf3531b42aa274174b644b9547127e6. 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/GBWUL2258664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce9ed081fc11e37659a1d4b412a166c305d007595b45c63f3259e0157f2fd80. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/GBWUL2258670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf654c18bb7b2930b0580b137cfed8bea9e4f134f6368ff974632f8c6be0769fe. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZ5FN2301109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7534cd7317122c77f5c5b888a761d324d0c881cf1b35cd2f7d639addb4b12a9. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZ5FN2301113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0802507f4b172cd48fcb836e0e96c933d4881de806a2fee10d6938109ce83570. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZ5FN2301114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7534cd7317122c77f5c5b888a761d324d0c881cf1b35cd2f7d639addb4b12a9. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:47:19Z), 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/QZ5FN2301113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf654c18bb7b2930b0580b137cfed8bea9e4f134f6368ff974632f8c6be0769fe. 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/QZ5FN2301109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc78af6455e0080af289254c2c7ca957f40f00fa94427b31cc59fd75b549e7ef. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:20:30Z), 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/QZ5FN2301127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed2fd6a3a3a7d90383945089b838f4a0f3364cae7a940d698ca65bd7b313e33. 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/QZWDE2234307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571b7d818c251a209c93289d5f54a2351094d524637e181d74e623877ce2e9b2. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZ5FN2313928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbc0719ff114a350ce2743eb12ad97d7605d320bbd93c56df60177bb361d265. 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/QZ5FN2313932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd0dd6a46746c0798e765ef267077f9bc45eaf8766ef4a9acd36ccf22461c19. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/SE6XW2331593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6572535e56f0f8bbcf2e85d597d3fa60289d7dde521df17bf79314f18ddb49. 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/QZ5FN2335896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9285605159f8e54713b91522b61fc6142f2ad757b8abf9aaeb295ad84cd3a82d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE6SA2306174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d88021891b7dd54f6039ccf9f1309e12f12f603dffbc76164b824227a48bc6. 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/QZ5FN2335910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705a4742c3f84051b760b69e6bd0c8bfdab3aa40b9c925a218feba5da8965ea2. 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/QZTV32349355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63002c2d56bf734471b614db817fea7086d84cdd0b6e24ae8f4a7905dbf91f1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTV32349598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9008bc7a83a1b1ab5033872d635c52fa47fe5fc1c3a114af93e73783081fcbb5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTV32349619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd143bdc2679e9bd4cfdfaeb20ad8181c9546f62cdb62d37cb611d6fc41c864. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:22:11Z), 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/QZTV32349858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bed5e24046f442240a3a2974e99c6c2c9928adf93cc61927b14285cfab0d8fc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZ5FN2416200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f52ad578a254f5be524bcc4f80b2b7a09086abc07f0e84f064b9e804a8a3bc. 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/DKD3Z2108700.