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 0x118c0f008fc3e7c103b8fc3772542b248ca3ff6c183dee4d469699812a3ffa4b. 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/1f5944cc-63d5-4cd7-91b4-6e33037b9009.json and https://artists.proofprofile.net/proofs/artist/1f5944cc-63d5-4cd7-91b4-6e33037b9009.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 0x2ddcb90e7d1dcdc760a62bf6fbe632add34c19caeb9c50874f7618a9e4fee0b0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/ZAB051000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6d33417353225495636f7d6a68c196ceb43c87df0aea696d6e00b15cf4086d. 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/ZAB051100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6135666f690c9191f89cd2b6071e07100a50ebbfac2876e94e1baef5cc7b16f4. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/ZAUM71100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7ceca1627062654d712488954c9e8a5a53e727cbcabc680f864e421f383f12. 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/ZAB051100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdda63a42d103ab0104917a9133dbf2b13153f44e4970dcec53318c14b79490. 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/ZAB051100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7e3ac41f02aaa1785f5ab99d0ef43de3df835716349e6907bb73d12a16ffb2. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ZAB051100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f06bb893769c3f5191aa045f42d13cbc978a97acc5b754b1b8bd384a45ecea. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/ZAB051100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99436703d4f28485eec09a9481a1a7b1c739ea88ceb9eca149783df909f61186. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/ZAB051100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1d87283992d42a92b94de75237822d28f0f0463d4bbf0e0047961ac2f89152. 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/QMFMF1530484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf44acd011ec865589350e51abc51d7f16379c562c662a6b2a8e39462900766d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QMFMF1530485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f00fec747eea194fd7a3c96bf814e4fb6033dce1e3a5e4128cefff67584c16. 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/QMFMF1530486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599146a66f627ec6098381f455770120a8e8b6a187be53621547f82c5c3ee3be. 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/QMFMF1530487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b361ab64e314ae3f3c703b0b06566d0816d228f0cecc09954d5a4be6718cb6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QMFMF1530488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb8997fd60611f14cbf8713ea8f56b0e578035da06ff8bd62f6b291f718c562. 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/QMFMF1530489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf3acd6f251c3f49a4c2644054c95b2969d401d2a719048c7ecef6faee8dd31. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMFMF1530490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c80139758c6c28d0fa15b6429134ee7ca776625edf9a3b5a63f3e05cb49b5f. 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/QMFMF1530491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5ab62c189cc9d629d723e7674cb12c4024745e4c2ce471c93a06d2a951dc63. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QMFMF1530492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994a968f7044464a0e351d2e4223e67c808df6d18914689be30ed30f3df5380c. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QMFMF1530493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4ef878dbcb1d828ae7362eb4aa741a04eb13a9735d0e093691b8b4014392d7. 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/QMFMF1530494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa19de5447d9b10a4884180c119301737c1399121c3c65978ef6d517c657dc7. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QMFMF1530495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5053443aebc17a86934415e1e74016a90af087294d48be180e4b4295b2ecbf. 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/QMFMF1529622.