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 0xd5188fa2cc9b3cc1cd2a56769f06427da878b058c77288466dcba835a9c9da3a. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3aa750a-a04a-415c-b9c5-d28cae346034.json and https://artists.proofprofile.net/proofs/artist/e3aa750a-a04a-415c-b9c5-d28cae346034.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 0xadeb2e59dfe8d964ea4327389c31099e80ee80c6e78ca06f1bb05f416c5f02f9. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZMEP2520089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a7bb367f76d73dd74982f5932800e1e4a91a05c8a30a1dd69743e831d0c4ed. 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/QZMEP2520090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd343a719f387333d3f83ecc98c5f9d1ef17a3b2fecd39fdf40e25c8591ca081. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZMEP2520091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8aa0d0ecd078d92c94d1236dc1dc1212d952da99bef19bf51dd022c2d4414ad. 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/QZMEP2520092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67938513c9e2febc5ae67b2b15f79b453a1962622907eb6ceccb6c363e989cd5. 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/QZMEP2520093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3298e2e6cd2967d9975c7a265d37ef93bf43cc03b65b4356e762737c6392ce3. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEP2520094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92be6c070ec923099bc668e6fddc5dba875eb830b71849feaebbe510ff077856. 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/QZMEP2520095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16eabea4e7a893afa72ba65b0da0e23cb513585d43f71784eb2171d4331d3721. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZMEP2520096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b99957a1a206f0dbe912d7d28ab4eaa3419bd76722074a91bd43e4edca8645. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZMEP2520097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe15e1539e50c666f76b770368627c2689225c9262bff8595f9cf132aa9c84d3. 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/QZMEP2520098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490d09248813fbd28e76c466121c1f90773f93eb6f3c30edb8f1edddb6018e0a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMEP2520099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1143f565347e5daef21f926fb2c0b84c7172d5d9887669efe0cf2bedfbd1af04. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMEP2520100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b92b225eb301f5e0ee7d1360e336be4d229fc97255a00686ed2581857df863. 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/QZMEP2520101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21420d8ebde132081a973333ac10b51988be46e90e33c23308da8341e90462f7. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZMEP2520102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467fa805def70ff4f1ecb0b44764ceac60e7dede7ed4d79dfe355c1568688909. 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/QZMEP2520103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe2b130daa01306974017dbe4072a915be935b27126907b7eced1e116783c39. 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/QZMEP2520104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9916264d2921946911a367c2b16141d2b0b4b654b15b34829517305bb0b63d4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZMEP2520105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a89f0976fec337232493299a3d228b7630c637f87e820e4b86102e4bd6f478. 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/QZMEP2520106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ac7fa9d53e235207a9036bfc0c6fa799886ca49f2fd43cebe2c6c10c97754c. 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/QZMEP2520107.