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 0xebff21cdd435d180753baf2e589083ab4cbac2d39e4f4ff1718ef7e923b7b720. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ac866ee-a851-4998-9498-5e10e2d03249.json and https://artists.proofprofile.net/proofs/artist/7ac866ee-a851-4998-9498-5e10e2d03249.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 0x068899d02593cef175131edcebf72b51795b1e9e10fab2171b655e2509d92723. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/AEA3A2177514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1361f120149a79ab1844908b3baf803d8ac967a9836b52024f7f977c2189fac7. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/AEA3A2126713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b47c4ddf9c97fd0989519a387d16a79b79fc4f67a3154cbbbc0d232bcad0b05. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/AEA3A2183083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143a832847b5238d7a2b5927e5b137869bd5192ac58c26011168ffe0d60fcf1f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AEA3A2192177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1548ec18c48a67b98b726d76a5e54a12b7ee7472adef42ead74d51bebd4211f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AEA3A2195233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7ad11dcd9cf44c87cfad8b519d7cd93cff9547ff44f2eb6c7fe5f277b3455e. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/AEA3A2177754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cb4b4a353a4ee17ac31f948408767c786871fdd5c121adf55fca9765d5bd2f. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/GXBAV2117825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc5c77c18cedfa7b7b231e6dcc994f8d3a89bea8657a657c832a3c3a3ba0996. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/GXBAV2113615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e2f231ed6b4351f55c0758ba265154b6583a96b2c889d7683c6a9947787ebc. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GXBAV2116753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539c8604fe0703804d84294b17cf3667560e2730ef91a63072c53d96ac9b7372. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GXBAV2189999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af7eb4e1ec899c2ded4d262df3bbd63aa256086e77f7cc373fc0bf5003a66cf. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GXBAV2102290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352222daff1e9df4021919269cfbc8c2e0b2e3b144125bffc0247b09458200a8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GXBAV2122348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77881911810e18fff1f1c3d87820108ca852e60baef9351d6f13b058adfce95d. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QT5M32574208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13896946b3b440e4ad7d3404c12ea488c9c43950e1d404bf6d3aa736cbc01684. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QT5M32583164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f26e1992e645f82d2a8b597ee7b576301275a1f83aed90c7534162d60fc2c9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT5M32525570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede603da458315e72bdfa9af298af95151195d6f6bfd141c80c2fd811e6fba52. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QT5M42593931.