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 0xff81cf352aa64f10a7f29572e68bbea249bf364f329bb1aaebfef44cde6be442. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1caf8eaa-314d-4f23-98d8-3503dddfa72e.json and https://artists.proofprofile.net/proofs/artist/1caf8eaa-314d-4f23-98d8-3503dddfa72e.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 0xb4c3008b2419babf3601d561686aaa130ad606699cbfb004a3c15284969f1e77. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBLV61626232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35f817f5b28779a36d6c41bbd9d4d40b72a459e5f427a6dafb424a8339d1262. 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/GBKQU1344414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13de92d8cabc9b93d73d20c916b93b16b11519248f8932b90318a54a9fd8e43. 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/GBKQU1206831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5711318b1bd88860b7a2c2aa0251211a504b3b8e82d8bd616aab3974573214. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU1137292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1239d1eb3dd27bdba8571d179e5440936a36509377b9ec2658c0ecbb2013fb4c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBKQU1013574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df0f6a07151e55972907f5ab25a2ebaa3edf515084e1bf3b073413e27d8a22d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBHUD1300104.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3aa9d38c6b715a6e07a8413e8a84fead83528dbbfd1181f9f64dd0a5b416fb. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBHUD1300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8d318394bcd4911c026828ac01602b7db1ae04dadff6691ffcb1adc1719a50. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBHUD1600277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bc58d64c37976b6b6cabe3d6baed3a0b357845744780f4905d76c719bc785a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU1013573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf36c75bf74a838544e3424b358e1c564f1acf72bbbb2fed16104b95f7f383e1. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBKQU1013572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b9f0f7347f61d5124fafa7a47db9ebd17a3effb8f68837e1c19d89f612c363. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBKQU1021695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc020c365ead77385a20038833dd10c75567518caeb4b3d06d32c90a7db9b115. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBKQU1021697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdde93675814c554136584088370a6a661895e5e7603576497812173ee1a236. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBKPL1255180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d0ce08344c0a3d276b37c67dbae9cf7de27bdbbb1c687391f4c2c673d55afc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU1297077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415a147c87b8bcc132c97bc3fc386104b54ad81f307def3bba1061917691930c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBKQU1974434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2646877cd5ee752516880b1c5e3b138dd3ab2320e94ad2adcde3a40f494d61f. 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/GBKQU1134502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a7ff802c281714f267e0f052d41c89a75c9a10b8f4bf5ae2b287b16e3bbb60. 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/GBKQU1201278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671b7c11abad14a6f4c20b9baa43381e1e26f5c7cfb0ab979026d7bddc614ff4. 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/GBKQU1329556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca863f5f12d4f6b681bcaae5044e0d3dc28fb5f99c0bf7abd81ac5a92d3a30ad. 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/GBKQU1154974.