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 0xcfd78445fe28768c9dd1ad1f3ea82bec4a5cc22895ce2563bb349b5505c6d9aa. 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/d48d3a77-3005-4dc5-ae8a-a2224ec87342.json and https://artists.proofprofile.net/proofs/artist/d48d3a77-3005-4dc5-ae8a-a2224ec87342.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 0xdee2049c95783372df4f3983808e34bf9697e33a81918ca588ecc7a62f224e0d. 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/QZK6Q2091823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d76081e49b88f89813a35ed3c7704051c2e56de87e2b5f7fc3b00594e4c0d0. 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/QZK6Q2091824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333d1424e3576611f2caa122f23b56bb291d8932349e2bd96e09d2d53fea7708. 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/QZK6Q2091825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ba0f2e69f48a60b9b7ac9239b4403eae338afcc0a7a44f7243264ea86568f. 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/QZK6Q2091826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e02c666059476f3584c7f9d254e1ffc36e8fb23adb062eb88b1a2e8736a19ce. 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/QZK6Q2091827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f47f3b275d7e5f3efe15118262b538117c2fa6631e945aab5ca14b6ba8f068. 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/QZK6Q2091828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314630b954ea0d58cb570a0444228cc08399535a4ca884740654888759c8c878. 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/QZK6Q2091829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34afca2f9f9671b07631035a9ce0bd6d2cb85fb6d355a8cda4c091d04f3ed758. 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/QZK6Q2091830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dd22de8446695e3dea3359879e192829fb47124069bb62a0885af4e0db4d2d. 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/QZK6Q2091831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb535feafd981717777a8a02998e50a68aa8a30a700fb3f1e1d32b404d6a31986. 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/USUYG1491205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1ef479951d6f581ce0581aa3a5c134560ee6dbae7c4710a900cf141daa3b08. 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/QMTND1101383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb567053320d60fe473657beb0479024e6bdb4fdfa61d7f17272d02a30695771f. 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/QZHN41978670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8132587a734b4904ab4ff17d36106c059814f19abf4220a0e0a44957776e5c11. 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/USUYG1334163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d945d268c9c5d91b48204f6f3f047d6bf1a5f9290eb0fc3b2b09a43cf88d3d. 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/QZDA42276524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee5ea5c75d68cad6241501c178081609701a95470071e7906ef8b04be7671c4. 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/QZS7J2477673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6306e7382a5043aaf86a785e2f9dd578c5b342c7afbb8120937631afd81e3cb. 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/QM6N22273587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d94119bbc2f098f42dc1dfc9bc0e9bcb683e0a7a8465e3a25d41dd47df541ef. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZHNC2498846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91762f2e128e4436e5cc0fe5a81d66e8670bc4506d14fb10408fafeacd9b105. 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/QZK6J2449392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f223a476867a9ed85d1e87505a1bbe45c1b196f832b87a5a29796c0d043f5bc. 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/QZWFK2328224.