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 0x4813d704251e8a634f3507d4ba08c9ac7b3ef296876669cda7fa33bef82c2fde. 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/1b84e817-0956-4781-b8e8-5535975da3e0.json and https://artists.proofprofile.net/proofs/artist/1b84e817-0956-4781-b8e8-5535975da3e0.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 0x339a2ca5ff91d6cc5db693be655a27d16bca8b03bf2d2849a7fcd5f57798beca. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZRUP2200493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f8be3e46fdf9120465154f9b69f2faf0039a3b6ec490b1a9db54c3d9ccd272. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/PKA061706303.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64315906b39bca9d9bb8c5c61b4623deb02c6a210cce2c18bb66c8bfcc2086bb. 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/QMBZ91548688.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1628054ba087e9d3a0f010d702d477c07276d8d830de394876ec4c6f62775b. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/PKA061758113.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a68f72120bda5769017cf9a9d45ba7d9064dc0e5e5e8406f4ff2ff75e24fce. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/FR96X2250522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4f51f6d3b6b1db12f186cc7cc64bc761a0fd36365531ba0d7a82110bf41027. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FR96X2213547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36e7b05a874090deb57b1858f071e7286a15f544476191822e3867b20d1d978. 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/DGA052375407.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9874a89b5512c257fa08deefef3681f47d7010fee8622cb5852b2a4ec0ee1d5. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/PKA062311048.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1161fd61f06cf6c071822c563ac2cf44cbd73de76e33142917a1073f0baa41f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/PKA062156946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39ab049f9737719fa37a8d030fc0925a0bcd7340efdd9c61ac5c67399826403. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FRX282508369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd4fd0db78a375249184251600c3e7969b9c4f7169738dc0664da6caef2820b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRX282531874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574a45d280211275bee688d180ccbc3a83fb2a128ecc36a6e42c132e354565f5. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/PKA062316088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a548ead38a26a09a80ad4faa1df6d535d44ea0b1261fd1f5e45e98f7842cfb8. 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/FRX452522031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6687bb6c4c3892d62ec7e012863c62c8910f164e972c38135056e0af1a1aa2c2. 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/FRX872598233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ad41b9a21f1d511bfbe6aedc7f1f4af9098265b29b4c9ffa34b8ed2ec04692. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DGA052596720.