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 0xd12a3733be54e45fd0da561f5fbab0b0b1e80caa974f74b3cea597be08b8a4b6. 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/8a9990de-6672-4310-b67d-423238e90823.json and https://artists.proofprofile.net/proofs/artist/8a9990de-6672-4310-b67d-423238e90823.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 0x55dd39fa971d860c326e958c42e61942a57b1620cadc4c644b8b469b6afca299. 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/PT4CA1731860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93bb429997d4f4123822d369faf47eb008e4de32a1736cf49bf27aaa059ba564. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/PT4CA1731873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f837dda25e95c4ae2b7b4af968c969824db0cfbd64e8831f2ba12f73aaf5c6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PT4CA1731875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4a34827175ce53c9db44a3e8374086509ed57aa88d91a9968c366f27c0479a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/PT4CA1731867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595383e1cf61ab95d852255298aa93caea04a204ed90ec3aeeb23a9f7b6ea6ff. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/PT4CA1731869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c26beef2bf0e7ae02da227ed15f1094342f1e759e6b41fa4a494285cf30f0ad. 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/BC1372100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21b2654bfb7754da8db40dcd124ac6c20750dbaf7774f718284563557c85231. 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/BC1372100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e43f77a0ebdf42f488c436e7d8145c1cc943615f71754fa34aefad3506a3e44. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/BC1372100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39ef07eb10c8ec6274af70bb4c70ced9663e60338bbefcb910e337192e25eae. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BC1372100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cb152915624cfb5b5c3db68275860b90854380bc572c7186fb7b23784bced9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/BC1372100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea458ee7bf17dc1702aeb6a260c7f312dfb31f35f3f772a4b15b6f35b88b004. 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/BC1372100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e64bf959752aaf967c116d6f5ceeab7e9d5ae463a9473f88e4af2e69abcdb0c. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZNJY2124956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ebe1f085030dbf97346a3fead2b5eff35a34ac4ac2d5c37b6e883fc8a43359. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZNJY2125418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb518b39db62d657f0d649f3bf0dda6643bb447d1f93b81e33e9ffaa5a8d75b16. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZNJY2125421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ef353adaa14e465c144a82db70fc70d37ffdb22ba30eff47e1c583226ea6a1. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZNJY2125422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3089b63c59b9c83be8c3aa6dd5b1c9d7535b4973590f2a75a422ba8f5dd68895. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BC1372100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d242882b38c04ed16387489d21159259ee059c7a3ff81bd5137cc09cb5d1915. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/BC1372100042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d5427819fb0925550d491ba3cd83f5df067acd2e6ec394c63e185ace60c182. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/BC1372100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4780563e3835c4aa36e37be212944cc2047de898b5601dd79c905de3885df754. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/BC1372200001.