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 0x8f71b9a6fe4e88856f8cb767ecbadf3e2bbde9640a032121e3ae0bde5f07224f. 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/d2d9f40c-028d-42cb-a794-0837e7425b9f.json and https://artists.proofprofile.net/proofs/artist/d2d9f40c-028d-42cb-a794-0837e7425b9f.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 0xfdb0ebaa060740a435166b04f212b1c4c507cdd6112bd17e3f56391fbb134f25. 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/QZFZ42452540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd24bfbb14e1a500dfb091f975b12c9036b0fb29f5fa04e0b59abe757e7f65e. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZWFE2310982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f55d50bf0338bacba9a33a0d2694024867cd45c2ad830b6752f3ece497fd93. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZWFE2352412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503ab0a98f8514965e791788e08f49c74482cb8273f0e26bde2a7bc30a0e25f8. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZTBF2354818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac33a50b067cf117f61813aa8f71359ec1f3ecac34d82af998c1f72a72581cc. 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/QZTBF2356925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83379241fc387611fe02c6d4293fdf6fbf5e56f5032e43a1072a8584c0419c47. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZTBF2356926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b4c82d733f8abb4535816590fc87d21f86a89c9addf503a039d5b8a2e7d4d7. 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/QZTBF2356927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311a17ee25de8122dab156ba07203944500f61ac23ca55afc89d17c32c370b1a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTBF2356928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6709bc37eacd2a8d967884aaa3092be61e202341a6c646cb1ba80e0302239f53. 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/QZTBF2354817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0824d2a66c11907a69ebf52a3620c404c317e204daaefea156969feaeb653486. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9K2376981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad9174bb52d700d3f42cc382400c196599baa277c09bfa05dfa4e74ec566410. 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/QZTBF2319538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921f2410d870760eb39c3a14bb012bda19f00404090cb88ff6765fb8b1ff56d6. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZTBF2352250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe799af74774fa4cdddac516debb332026ed2615f74d6cae0978a5e1bd6f613c6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTBF2319539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff1ac735236bbda0c2c0e439f80bdc5c60ed0b00ad0ca8001247ec82ccf1d72. 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/QZMZ92355096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7be1df506af77357cea4659d34e4103b99af4c9ce7b0ce5f0a773095caae9c. 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/QZHN42539333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e045418dfce1584e957f086f08eda216f0a964c27f3ff1e4203bac71f6213f9. 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/QZZ7S2483450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c5745a0a3c93752613d96c2c8937b2611c2671e9dd91b5b409f1c78fc4f825. 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/QZWFH2447958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a20173a978ccdc3182cb1d309c97773bb895b6aef27791bceb783af5e7639c7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ5FN2591389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f0651451a5db019ee292b7e64c97cd0e6f05861f2dc4fb5c1d352502ad3207. 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/QZZ7T2403573.