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 0x3b7280b4f84dac3022d6ee42cc86ef36472a9604b61b9d758d0569cc5f5c2e72. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5672b147-f5ec-45d8-8dbd-40fab6a972ff.json and https://artists.proofprofile.net/proofs/artist/5672b147-f5ec-45d8-8dbd-40fab6a972ff.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 0x3ffb06427ee6bb853b424bcf704a0b2f80aa15aa0dc026238c04b57393c5d10b. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/CA5KR1945167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa8915425f7e372e98d27ecc9ab5488b91897b8be365c41e0ebdae5a43cb17a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CA5KR1832433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefe7de921ec059a19488a4c407d5617af814c88078a6cd1333caa801b3be90f. 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/CA5KR1847716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b89794cad8f643cffa7a40b94601a13567a1eb68c2c7cc68d7ce56e7634279. 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/CA5KR1945516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa8915425f7e372e98d27ecc9ab5488b91897b8be365c41e0ebdae5a43cb17a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CA5KR1832433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09233e55170f8071d1102a4513973be5cc9ac77019a77321c24f2ff1e343a1a3. 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/CA5KR1932914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a3b4fdd209fedd32173ad5a7c61a8465e5787ef403d65d8da0b3ae60b90c70. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/CA5KR1806597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb443334e9ae79a8694bc0d6379b18f4f40c3d3e03a336f8bcff1d5d5afc2f122. 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/CA5KR1832558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190444feb4f237865957a36e5de9e6002569cbef4579f7ea0af3ca1f3ecfd692. 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/CA5KR1840445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e023395ce604a83f480bb3e5065d27f6d2863ec595e868557209e518d03314. 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/CA5KR1926540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f92c2802ee457bacc196499f4fdb211bda66e6746513421ec18c318bf0546b4. 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/CA5KR1931449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26516fd3db3b728297cbf2c2c0a5afe3d9bcc8945e8b9d9407ec69e613b808ad. 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/CA5KR1833038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2b44681c2227c9a5e2c4c05d1fa8c8cd87bbd118dbcd0362bf169f2eeb0848. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CA5KR1931735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc7250ff443f1040ee3c6437d9624fc6777f138dee27573d93019a0cccff352. 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/CA5KR1929268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb443334e9ae79a8694bc0d6379b18f4f40c3d3e03a336f8bcff1d5d5afc2f122. 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/CA5KR1832558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c4abfde6002b4ed00100fa2945595a22b35ea1de88d75a1dab9342792e7b06. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CA5KR1832105.