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 0x54c44e78787d122364b9d1559219618a416037fef45e60df8596e28f46fd82ad. 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/8368b6ef-0dbf-4221-bd88-d718d14709ec.json and https://artists.proofprofile.net/proofs/artist/8368b6ef-0dbf-4221-bd88-d718d14709ec.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 0xefbd48e55dd571ff2ea57c12980a9fa17501607642d78e24d92027ebbde53e38. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZN882566739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571befd98043e25c44ada746124ed014dbdb166f5b3212664432a318dba49c26. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLS282300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab9b360c610afe708f0c78294741d61eaefd56834e39d2bf24afebfe9cc5023. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLS282300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1985b842c7922e1b2c354ba5a9007bad1c373ea1cc6382a61cb10da919f6b6c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLS282300096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fb4fc51c3ea1af5dab7b23e6a7346d76d8f861bcd2524e39abf919d6596683. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLS282300086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956bb0435ae7e8b8d472c0a5b13b851613ed53f60c45fc81045307b28d9fbc78. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLS281900538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864621b6512ec56210eaaca7e0ef4621ba35fd0ede0365d71fc80ad0539de815. 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/CZUM72100509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa887e281cd190dafa95f02545ec22b86d35d988f69079f013ba650bcad2e1d20. 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/PLV402000668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cecbf78c11bb809054cc25b34f478cc7ef9bf8a7d171d17c1f0bd5e45de94b. 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/PLS281800377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be0114e1e18d6fbce4796fa88824a4837c1e1605505c783dd518733c4e14a00. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZN882125379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39d24f7a4851a8d6fddab6af41b7a26ed4222c34748b97789b014cbd3eb5407. 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/PLI291900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e20b4830b83b8e8c047911a19fef7efa7b1a3206d62e13078d34dd3cc7f13ec. 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/PLA552300675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147f521be79a40a356d9861934ac0537a61c3e932b75a9100c7ef3a5207d1169. 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/PLA552300560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c6e1b96d1ce654c68b72e7d201b9b0737272bb39b543cd02cb79fa496e29bf. 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/PLA552300676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad60417b8c976118784fcec3b2f5274c8c4c52a81467c5118d71332de007754a. 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/PLA552300670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3315a47da7ea870dc933c110f793be448b884eaea5f4ffd26a3e41b68a6957d2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLA552300677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b125353b439eb4f8fd99f89a8a1d7db297ad6709fe91415bad3ce19412707f. 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/PLA552300678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91482c87dc6e7350020f3914a4ca6c93c8ae63f76a2403a990af66c3cec1ea0. 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/PLA552300491.