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 0x7ce05d38bf7666253f2362f0d215f7891b200341b93e6fce70a8460d737b2b6e. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c781a24-92b4-46d0-9f6d-7a789a026079.json and https://artists.proofprofile.net/proofs/artist/1c781a24-92b4-46d0-9f6d-7a789a026079.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 0x5a88840acc2b6bc057621193df56660098de7cbaf93a2fcef363e364a1ff8cc8. 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/TCJPO2144068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a88840acc2b6bc057621193df56660098de7cbaf93a2fcef363e364a1ff8cc8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCJPO2144068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b6bb2c069ffa38468200605121ead6a4d43ffb62879d0e8d0218a19c32cd08. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCJPO2144070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706667854e4e12dc70679cbb3953f8b17c03b06ddca9b11d332d2f5cd8f8f880. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCJPO2144072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef924371a6623ee441b6d1f6aa0e8756dae33b20dd63006672ce364ed23e3bfa. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCJPO2144075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cc947b3fb9dcef9aa5c7215a97230814ca747d12434e34e55940163cd2029c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCJPO2144077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bfa6011daf2f7ec0a01f4c246d3da24a1fba498bf33f9af21d8c94f6e69cbe4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCJPO2144111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067ea1bbd9e5f4b53674a31584b03cba3102377bfa6d64c8c179765b250eb6f1. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCJPS2210837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067ea1bbd9e5f4b53674a31584b03cba3102377bfa6d64c8c179765b250eb6f1. 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/TCJPS2210837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8c1c6da80df2607997e921006a37a0c4f229bd656e0cb814e27c0c2c30c264. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCJPS2207756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7da1dee36f7510790bc1675fdf964330858b3e873ad837c7f9e60e2ed3da5d5. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/TCJPS2210840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11dabc16174d801bb6ca1fe5de5605aeb316028f37616fa16d413900702489e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:23:12Z), 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/TCJPS2210841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29208e7b6a79a9327d6e25f935c628811d2cc84b9c9fe914fabae2f4b35ca2cc. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TCJPS2210843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a556963ce6ffb436983d0736a83d7e7365120da0074b28079e7387fa457a8e. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCJPS2210844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584cb7057b9ea90ea9f34dc01ad9fe279b8ab4c6421d37574b89c537047c9243. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:28:34Z), 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/TCJPS2210845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4283c2b22044d7e5f79231e392f2a735edeb65d7923ec5baac978da6902589aa. 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/TCJPS2210846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51b15ed6a8cff9207096c325d8eea8a5d180454abf8e34fab916e437c971044. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T14:44:16Z), 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/TCJPS2210847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2b03b548cf59dfbdfa2e6d95fb89ece463fc90c13f819522e5ccf495572e11. 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/QZ5FN2151107.