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 0xd52a20cec548c52488de42af4111d97402a7881ef0b1f132f62d98ed03e69149. 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/c3d3322c-4b5a-4aaf-a39a-28f441fadfa8.json and https://artists.proofprofile.net/proofs/artist/c3d3322c-4b5a-4aaf-a39a-28f441fadfa8.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 0x75ca407390c5c6639b64564032d4a7fb4b80b6f7486c026419be92e24d307074. 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/ESA122443189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48f05e5ced0a025a5c5d6679028ee123f58eaf6b83364b0795c456e4326d993. 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/ESA122443190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a9d1171e60ed54215a03c1c585bd92fc9359aa5009dd7e764f3da14785128f. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/ESA122443202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b89e16bf66d4d2fcd11c2ba016f9c38651ac243cb274e97b78b57f0377e7cb. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZFZ32029014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39075d3fd96835b43a3db6be7023c1f0b72fcc14ee8e677d4593222011c58991. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/QZFZ32029016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e9c9de974edbabee8d8510f26f2079f636753e6dce486507b2f8b8defa98a6. 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/QZ8LD1994260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1020fce9ff148e7006bbd4ee25940e41ffbdb54eee4dfdef0db07dd856da3c9. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZ8LD1994262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd6d392952ca7b98121e2620f3bbccdeb99c15b21872b4bfe20cb1955e10505. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:43:59Z), 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/QZ8LD1994265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f56c20b9819fb23537065a24a1f58f09d4b9e7fd516e638a984082ee2d69602. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZ8LD1994267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dc152de347a4b099d2a7d84689e7e5fe69eac07025612e17cfa520ea734528. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:58:50Z), 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/QZ8LD1994269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dea67c0b25146f4e8edd8e7eff73a8f94ea40513584ac00db2604e21926eb15. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZ8LD1994271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c88c22232413b577a706cf8b876f2baaa4b5a54017cfacebcd36d09129236d. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZFZ32007110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80efc5d0e3503aebdf985a5c7cecc4967db72599862f1547f40ba101cd25b67f. 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/QZFZ32007113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c509af364df905bdb28dd540081c4eddf62131d3d2ed6038bfcec56c0682a5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZFZ32007115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775d8da311503e58daed746e5d21730fbba206650eec6136fea6a1b873279dca. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZFZ32007120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66469892f469691b001b41e420a9d98826f444e6f9c068a5af9d9d925a85dd36. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:41:34Z), 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/QZDQH2256221.
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