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 0x4b7b542159afbf9f531b813ff3f3cef00f4ae7a4e4c7914ad8d5ebcb20b05b58. 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/e83b3e46-2d41-405f-a351-f8c328f295e7.json and https://artists.proofprofile.net/proofs/artist/e83b3e46-2d41-405f-a351-f8c328f295e7.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 0x9b632ab3851fcea5354407289c36ef7724b564f3fef22daec1992805a7f246e2. 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/QZNWW2125444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed3fbcd0623609c4986f77bc3ed75ec10612e6eea642aae8ab3542f506bf3ce. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZMEP2257234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31058aecf66c4f5da7d66336952fd2cafcffc52b16e0aa5381e143a8549adb4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNWY2230101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25e4a4891aaf41dab9d3b24c4f1d16fb590378180f1781fb48f18b6a79fc9a6. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTAS2293023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0a112290f8325c1606477ea9642f1d1f480bdb19ee0cf61c9c3c7d9aea234d. 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/QZTAS2294777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538cb6eb1cccfa3979a11940b6fa2a19d7ec54358c849544291a6036ec356db8. 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/QZTB22251468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6c92683fcab4c1a3b271c3143ccbe777d3ad1e82f4f948f23deedf0c2bb6f5. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES72392594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb876c071b465519c892c6027a4b132686bc7f83882b0fedeb9265a998b13b665. 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/QZHNB2395642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ed790f403d2e70da16cf7f7253194044aa2c2b55f673ccb888bb89fa8cc0f6. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZRP42347434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde46cbf5009783df2741b859a3f6dca78899b6442691a0e6e8abcbb565a3c266. 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/QZTB22360486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8c76cca8a594057b98b89983f9134b0b66569a6daa624f1e1378bf6cce3041. 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/QZTB92320516.
UK Winter (Tesco Value Christmas Bumper)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78e0be0f798a34e39925fb00deb4ab69e8859fbcdfd70a3f67385373cf9f188. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFYX2478954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2076cf64c934c5feaf6a00dd966c3b4184a8946da1bea956b2b3c852efc87835. 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/QZDA52476403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf420ef3cb65dda3798166e9b527d037711d2b9604a5f70562dcd2c6bda62aa. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZES82481681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3430383b3ce6fff100d15cdd31c1c685f85ef66d68af392b5e9c424c052e8a. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHNA2477987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e1217fb8a26bf78237b5bef8dad4115e4de230403cf9af02ef91278d11886b. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZK6J2420890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb18e4fa50c7b05c6ce1896d3e9b9918dee0c205e2495f7906a526dd9ea063. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZMEQ2487733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72c8f51cf9e4a63d4b8ad87c352037d0aeeffd57af10bebc33f50140434df55. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZTBD2481206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c0e393e459ace3749efbdc2449007488679c18145bca722711f4f712f51407. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZWFP2496476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25220b378e37dc60ff1115ac03ac50ad7c9936b56eb47b28eed75a864de53d0f. 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/QZZ792491929.