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 0x1eb5c141885ec3bb566e7c74f40ef03d7107a27f8b33b4aaccbdf535371c9ad0. 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/bcf5f0a5-fbb9-49ba-a9e9-3f779ab6602e.json and https://artists.proofprofile.net/proofs/artist/bcf5f0a5-fbb9-49ba-a9e9-3f779ab6602e.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 0x330092433cc05eceebd16492e6758f74d7773eb50764db997abe8387ab331f24. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARACN2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24cc725af6985b2b2377769a72587c4be68b0c314e70aa23dc765344ee2a002. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARACN2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53df673fb8c5fabc1f50b6491ca335745a6add7aa0fd1889c55100ea29456b6. 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/QZNWV2157694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e25e5266d339d7e76bb99a83a11230efa68d83d03987785c91835db6a2b27a7. 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/ARQRD2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdd520d690791628e117f3fc2b81d0411252b398cf386e51a3fd7630e2f9546. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARQRD2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa96be53243c75d9f8cdb621749c689b59abca49be10b7e944e735fad87ba7db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARQRD2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e396a9b978d313d6e5158d0c2e5324430a1c18c3838e72700048fb0dd071d71. 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/ARQRD2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0da0069d20c7a60ad2a44c6046135a8110ce7403ff6b35da3084cf703e4c77. 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/QZW9K2337909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6758949f2c447baebad07b0f64a2a17cc5ddaa7e44567cb06029bdfa1111365f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARG991040785.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014814fae89ee98e08539a3d9ed15b4a706462d3a913997a91e93d66f72651fe. 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/CLAA22400202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d37fc298cad7539d68ddae112a13be325a59d93b7a90d144ad1f0a10bcf98c7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CLAA22400421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc294c1527e179de9ecd2ce22276125ca957acb6c840b69d2690e4269908bd417. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG2525782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc87e92ec8bfa404db118054cd0496ed0fab3489dc663b0633d54f0a30cbd38a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/AR5UH2302594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374a5423b2655c963dc04f78edb00b2b027b671133e2f6f3e10fc26d6b275abb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/UYB282317010.