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 0xc4204a5b7f8c7d9e7cdf5147cbf0bb3a9c080bf8fcc03bab5f799f5f8ace3d1b. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2121bba-8a03-4a2c-914f-4e6a5c80138a.json and https://artists.proofprofile.net/proofs/artist/f2121bba-8a03-4a2c-914f-4e6a5c80138a.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 0x4f3d25e7fd0192d8ff3d7744c4c0fd7a88ced2b5152a75e6936153e912f41b03. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/CH6542126117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87716c5d6b078ff1a29a764774df460624d78ebcbb3c2a973c6640a6797742f0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/CH6542126118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebd7cbc8c226cadb2d2b301bebc8a8663650d10e2b673ddafc649913f953ed6. 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/CH6542126119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eaaa2c5dfd91e020159551a7e1954f75471508946dffb0ac9c3cad16b4a087. 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/CH6542126121.
Le jugement des jeunes filles - Bourrée à Mondoly
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8f2dcf01a3298784fad1764372f381923fc044d72d5c6f59bdfedc29949dca. 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/CH6542126124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48473a4b40828f410f6682201a6496aa60dfe5ac1f32b173253643d36d79229a. 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/CH6542126126.
Le chalon de l'âne - Le breuil qui penche - Damon et Henriette
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917adfa2f69415c9be62216de9984d46bb16d488e06dd7ea82d0ab215309dcf0. 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/CH6542126128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601c9a52384c46131bafec062a668da1d4158928362afb7eaa0a1534df0cc20d. 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/CH6542125904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95284828dbe5e610773e1f1fe6dcf3136aab183d2d96a6e4cf29300d588a1bcc. 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/CH6542125906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52698ca813f1a757df792c388e5d273256b2305b46409542ddae2ff992e8d265. 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/CH6542125970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc3381764ffae35f87e6bf4e9fa8ba36d54eb2bcb6bae48694b667171442731. 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/CH6542125971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04b9ddb7c077d37fce294b10afaee892bbdccf510382781c61647dce20df973. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CH6542126020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c91255dd3d83791c9f2144d1017fa2f436e2a6b2b19dbfb33b600eaa029d0ea. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/CH6542126021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cf5dd78c8c3e6dd3e5d3c33b6da507cc9687526310217cda1d253ef7870d28. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CH6542126022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcb983d49d13a162b0009b7d1ee113b21c4f702083c467792af94f815bbc7cc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CH6542126026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8516f786ac005943c2607469ef8096a784dc2b62735a7a70a3ac8ca5d81b3271. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/CH6542126027.