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 0xd89ed3aa88465e23ed63a9bd0294de313a906639cb0d701d0db2ad9c43919b58. 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/3508f8d3-2fec-4376-93d7-3fe6f9d3a9e3.json and https://artists.proofprofile.net/proofs/artist/3508f8d3-2fec-4376-93d7-3fe6f9d3a9e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x48b02a02958b389cd8a37450b9836ad14a74cfef7fd53c987f758023ac41b558. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:51:37Z), 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/GBBTM1232206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd14de0ece22ea8c5e201b22ad6d4f47ed8ad3ee3fb4f1ae19477b5522d4de27. 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/US25L1200422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba27f392f3ab1e8d9275ff902121a709e54ff6dc87cbd53f4d00588e2fafd3af. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US25L1200424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481480375986b37cd44da05f5c9f4c41edaf6a666cdf03452c3eae5e0cfcbb78. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US25L1200417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c04397fcbc16db51d7b58316148300267b82147d8c39f2cc674be0a107906c. 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/GBBTM0777606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfddeb902f65a3f3b4408008e5ca10141ca668e37dfc390be50d4f7e9c3f295. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBMJA0700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d38f4ffbe98d4434cd0e82f4464ec66a9419cd28217e8f9feac27579a06bdc6. 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/GBBTM1013101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f64f3dfc22f536dda4b3d12f8698164b5336792ed65d5f2517f971af7052f62. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:31:40Z), 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/GBBTM1013103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8701f351380e29a2f9ba48f57dd0c6c7f82301841dbd3814bfb2378075ca63a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBBTM1013110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbc1b1f13ef851d179e3062f462f3a31d5192c2321c7e0b0713469eb4fa99f7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBBTM1013117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d38f4ffbe98d4434cd0e82f4464ec66a9419cd28217e8f9feac27579a06bdc6. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/GBBTM1013101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8701f351380e29a2f9ba48f57dd0c6c7f82301841dbd3814bfb2378075ca63a. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/GBBTM1013110.