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 0xbda65cd6105d2356baa52106b7dc693e87d87f319152d54f23fccb92ee165198. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2029d83d-a456-42ab-ab72-d04080f62010.json and https://artists.proofprofile.net/proofs/artist/2029d83d-a456-42ab-ab72-d04080f62010.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 0x1abde9debba98d4662e3fece43b24971306d30ca27720dd0a990803614211cd2. 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/NLG661800490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d0faa339c32a86194bdeb9bc29ba9948ce86019d7b3c80e69b405dca0dc44a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLG661800609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fc60bf773fa472a7a6becf1a584f9d17843e63cc92e9f69989e5528cb3e890. 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/NLG661900567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d0faa339c32a86194bdeb9bc29ba9948ce86019d7b3c80e69b405dca0dc44a. 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/NLG661800609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1292c1a86286b06f6ae56f069917d87630b8cf98e37310816659fff3ecc97934. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLG661900568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abde9debba98d4662e3fece43b24971306d30ca27720dd0a990803614211cd2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLG661800490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d4c573953e1d69e5480aa023beea0b48e7956960b6783381e65cab48a71252. 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/NLG661900569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294e9a116499092088569b393553a64dbf013b61e4a725e28a35ca50b7298b0f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLG661900570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5080e7bc23dce0196bed21b5b2008d316277c14be0d6d3472256a4b852d624. 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/NLG661900085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607307e8cdabbc38c038915fb676ac990e7e8c1b1b095e032888c9506d9ac3e3. 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/NLG661900571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301df17fe5ccdd80f923dc60f6c02d9b30e6434a977007533a6a76ca556df3df. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLG661900572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f76bb11970446c2602d1d0b24806a6f55e84f2a8cc9beb1cd56bfc07819579d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHNC1903373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9047408f4182d4918e06ff0a4c9e9302a40b33d28232340ef872f344926a1b6. 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/QZFYY2044311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f614ddbf44b187ffe7a91daae788a8df2f10942f3ab298fd12834bc55f09481. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/NL3BN2000082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9057fc45e906d5929f04ed8c416d1af221c66498326e36cb60c4bfa01a9810c2. 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/NL3GQ2000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea0dee9aed4b078dbdf3a6483b0864ac44ac522c365401d367e6705aeb33c78. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/TCAFK2175258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3371bc52f11b8b404635d333b7caf1a81e756fcb878e8a8e38ce0325673120. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/NL5HJ2100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319ca061a4c0494c2a877dc359de2c4fd2590b7813c09b49ed084c857fa437a8. 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/QZK6H2018228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896aa5225988af123a7726bc5af2ca6e88cec94e4c825bdb99fe18f2aa8a0799. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/NLB8R2000312.