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 0x29ee12880aec0318ac5f6b9298de4aa1e6eeff35b5085f4e520ab9df25ba5412. 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/64f89e76-9fc2-4f65-a02d-6295c82092b4.json and https://artists.proofprofile.net/proofs/artist/64f89e76-9fc2-4f65-a02d-6295c82092b4.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 0x0d085e74b4b5b7019144cce5335f17bec6d92eb16c533ad1b6ef6dab8ecc8566. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6P2119854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd454afa530207f376261feb4b43f13782c61e220c1803975b33a26c1c810c562. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6P2119856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49b14fa93f262b5af24b92b595af071f3c17d799d0169cf718d9da1682a36fe. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMER2132547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fee6abb2d7839b6dcb4946cba93c80fba860e34f2847dc279400d25abe712d. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZMER2132549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12beac70bc01223dde848cdaba31736095eb66fd17fc222b77e9da84bc5f06e1. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZMER2132554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1bb2ed4bdd6f9e36253e67e514f3cfdc5aaa583db5120e57adb9251d4d8a32. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMER2132555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad67ad622ee5ada7df48184fea42698d7d6224e1a24e1cbe616560d8924e6e4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZRP52172912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf549858f1d26bf27e06a5b48bd18918640cfe9df786cdeae78f05a891f58e64e. 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/QZRP52172913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6fe43a4b6ab554f13071c78c70797e2f915afeea7c9c759bfd13f091023042. 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/QZES72245337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf182db045c91f0a7bd515f87e9d260c1472acbb6ff3d6b1611b430a30311120c. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZK6K2259551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe614a8f92c310489bdde42fa430c28ef8e1d1caf597846e7b9f26b99294358c8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMEN2247665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe278eb4b165a5f4a7a638d0d80aa42720933ddae75a522bc2add94a907ed8639. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZMEN2247668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea99fb41e0688654ee7ffb1489912b5d9c417f91d2c9746d6f5907733b1d42b3. 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/QZNWX2257252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb690abd1160a5f3b9843cb0fa05315299daba020b27bacda8dc66315af6109. 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/QZTB62241913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0918a657121607f0d04a4f4b7a9f7abc8b483afe32a7dfd28e2c85b1607967af. 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/QZTB62241916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d1f1e5b3f6dfa4af42b0fa8d931fee62a1ed0f7f13d3dcb3c90cd99bdb80dc. 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/QZES72396798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6615b7b6a0cc3d4deb2b05217b1cc7e9c3b34d6b66e3f5f3946392931cd98209. 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/QZHN82348314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef7524f0661041f37a91754d663432bd215fbfde77607c0c55de320ff408860. 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/QZHN82348315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f9e3198c68c1adf10827278754bf0b6b199501b057a1f455498f5d5932f9c3. 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/QZHN82348318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb790b68531840c395693e62f3c1bacd53547c226932421444a4e6d416a095432. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHN82348319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2d71bff3389f0d096a7127fafeaab2ce83c8a0aee708f352239fcddea8484f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWZ2303195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53fbbf2517030fdffd33cacb0cc1c1d6699cd32b91045519fb68704d4e13222. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZNWZ2303196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e182a908c97532aeb0eb380c5d4d8910616551a5e6a59239c4c93c91e3c19ca. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/JPJ932400055.