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 0xb632fea6c7c9b04929a29291683961c80266ba31faa142b311e3f7c0128ac3f3. 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/9773f1b0-f4f4-4c98-bfa9-c47442e566c6.json and https://artists.proofprofile.net/proofs/artist/9773f1b0-f4f4-4c98-bfa9-c47442e566c6.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 0xdeb467ee83aba58fab62fd64b87a2af55dbd982deb2c106f6f6434df11ff08cc. 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/QZK6K2546844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99525720651c17525350583a60506f7f7477aa65338af43a77e7bfc52b38deeb. 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/QZZ7W2499752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe004275537d488e0329645335731e34c4d5f550baa19562587e7bf765a4ce1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZRP52472987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf373ec058420e7d608b4c897b11ccba35bf6236d1d2663c48eb89fe2a99876d5. 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/QZK6L2402179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804e7364067ce43f9251221ece61d7455ebdf9d1610759900d9d197f14bb684e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN82431264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cccef836517737a97b542a6d9df3da4cd0f258703fdc17290a584c5b5009e2. 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/QZWFR2398802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfd89184c809d7e03b0c79fbad52353c955b3236f7eca2ef1786a5616fa6a61. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZWFL2303342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08941174b98a5b9e9b5c57cf62b9bf536635a1c93c943ea552450f82eff6e10. 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/QZTAS2367093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a9a04fc3566057ba5b2e6fa121da9d1ad44aebe2f08d50a95b69ba76a044fc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNWX2304734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe80aef32e068dd6adc7761b2e3d13650b6ee1e8ef1c7ef48923fdf61225af7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN92312603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc25717fe5222b98c504b5702bf4fdb718021229f6362e76ccd32bbd80757c4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTBA2245406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0109c9512b2391bdb2fc5b18426ace4909e4d05908344da022202c67b159134. 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/QZNWY2224997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acc0c1bd9e7ca5dcb956df64479e95d619420abde9bbd563267e42fe2487b08. 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/QZMER2235348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27452f854334c2bdf5d3bf9abb638c11a6d1fcf52f5b1a023ada5e2d334f163d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6G2268967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136fa9518369377bfafbd5f6bf22e5a2c11fc34612496e97b57bc01bc722e998. 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/QZHNA2248635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40230d5cc479c0c7707d0a133d231ff79dcee0ca9862acbb9689dee0795bfcd4. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZHN32279005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b807938686336debf98232b73c667f32655ba1b80cf5888eb61a11812bc8971. 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/QZES52274713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f80774caacb732773a25ccbdd9e28a0bac67d6945f788e20e5dc35e24f29c8c. 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/QZDA52291522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0b02d021767fd9ecbf57f544d68b45aa1dff99d62e7823638a41e4d9ac2631. 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/QZFZ32254039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadb9d91fe4ba417530790604bf6114248475651ddb261a93bdf40b9b9be736d. 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/QZFYZ2209933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99b9796c10755c07078feee6ae48918b84c931857b54ba45f9b3b3a63cfd6ac. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFYX2208720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19d3b34e10002c74a17ca13255cb6578eb254d85d9b69510d979a8138fea910. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZMEQ2285441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcea21497484d3f12d0efef4ef6db8b7e9902bbe5a63ceec7e35eafca4785e21. 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/QZWFS2452382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76975abc2b00f28b48bbe08ea5dac44aa97e955f1d86d56128497a308176b6b. 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/TCAID2471033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a2a3119a90732e298a44129cf39ae93a02dc08588ed019ff6d6dfe271c728b. 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/QZPLS2389173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7cd9883beb8ed39fab43bc6258edc79cadf6ae400e28a4894fd98d7685279f. 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/QZHN42243320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040f01aa0f184d19f22280dbc02e3d7801fab988f79597e91ecbcc3c8e0fcf5f. 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/QZZ7M2445061.