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 0x62fe5e31c506d9b9467e8568967cddd175f91ea4d5f355d571ffe85adb0067eb. 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/c799cbca-7c06-4083-a1af-b5b0c36f84ac.json and https://artists.proofprofile.net/proofs/artist/c799cbca-7c06-4083-a1af-b5b0c36f84ac.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 0x80ee4c56d2cf811dece7ca1289db2432addbb745d9fed45c40dd2656a4d41be0. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/US3DF2291071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb189c0fe388fa33db535938c38ed8009617de6fa5eeac8812df6f09f6c30b7b9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USANG2236961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb55de182b67af3a01577e8aa3733560e6cc1aa511c1bc9276cab52dad55161. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:54:13Z), 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/USANG2246401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d7c0ed0f24ba05223f090f1ba3c028d3b1a78cb6d8143ec444c54d15a790ab. 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/USANG2254781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b65be9af13cd1807c4bf72d20129a0b968b714097c7d99b04786a5c3a188ceb. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QM3DF2259098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bd68d689dae3e7e6673cecb3f6451d3931078f712173aff5ca3059bcb4075c. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QMANG2236389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9753f82baf12d2d34c4b52f8993082ea65d22be94d0b72e483edfa10e2ba9642. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DGA0P2376138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c562cbac99a55a304054be477a71d96acee3259d329212f3542afe1f79d068. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DGA0R2336283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a0810bb3b1930c911db532155e2daf1a0adf92a173b7fc1ee17e61081d4a0c. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/US3DF2473491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f334fdbecb99b13e8b35378b9d05dafe91bbe7e08a17043dcbe492698f2118. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USANG2417304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cc42117e06b7b800eadd763a7cca940e5c2a58fde523866f21e298e05d7fe6. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZAKB2461007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba5f5c1888980ca969257a09748c8114364300d1403b9621aed42729b769d6d. 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/QM3DF2259364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3aec32317e2662305e5725b36a476f27817afd46c745cfa4be1e6980e5a2c6b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US3DF2462762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cb8c6f554e70f5b7a88dfcd1b0f1e32ba55310b9f961fbd3433b3d33090398. 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/CH7812407091.