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 0xb823e4a37a52b7ecedc4f91d22394b58fc56009e9124906c45b47c1e08412af4. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/436b8838-8c22-454e-a1a7-58d7389b77fc.json and https://artists.proofprofile.net/proofs/artist/436b8838-8c22-454e-a1a7-58d7389b77fc.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 0x0ae21dd1f876586ac1934cf1e82338aabc4c0c3b67a2c28facd26890dce3b6a0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBZUM2005401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced98cefa14984f82cb9d11c744bf9a5fa4e6c15001b64d89498bff81102e1fe. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBZUM2005402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe315942c533f253cfbc4194b49edb508a0d2543cc961307c83bf6480a0c8ecf1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBZUM2005403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5097d3c66851a234e4fce9ee32611532a6bead0994623c15c906ddc9cdb88ffc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBZUM2005404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b396871052941cf8262b1c006b2d50818ee12a0f612328a47b58cb74cd91eee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBZUM2005405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fbabf9c0c31ba6de4a82a7553f0f2910e6561081706c40fc6f857ccb28b058. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBZUM2005406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c5260e9e45c668c72c8d34bb41e6840247b6969f14955df907ce2c5bbd8778. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBZUM2005407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16c0338cee92bfe29691efde630f73a78b5b7211877c4521053d140d4b2f820. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBZUM2005409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0086d041dea137df0021c9470eb3fe3ee012633c09065fa17e53b3d9cdd290a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKXN22000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc935539c6823fe60da3c0f85913ea4552962e0046896043d4e2b070bb5246e2c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UKXN22000084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7d8f3b49efce14e0a24639f1857d4877e295b62a7ec36224bfde139e1cdfa8. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBLFP2091906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0785bba7ec59bf286c5c5a708b609d83907fdfda680ec9faab416ab44d96c3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UKXN22000139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fafee2367ec64c7256ec6561e782835c703a6b4f4d590cfe96e975d0c183c2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/UKXN22000148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0117ce09aedbc32dfcc975febb8b6f759f6c6e4cb5927a1b70304a3a41c24f. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/UKXN22000154.