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 0x97eb0fa2ecb6f10335ab025486b1d76053e29040e52b5162c167aaed534647b7. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49a60776-4b3a-411f-aa5c-67af2e02a64d.json and https://artists.proofprofile.net/proofs/artist/49a60776-4b3a-411f-aa5c-67af2e02a64d.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 0x8a05fbe6067d882e6cd7674437c2c1e13f5e5f55ed92e8634a5204383eecc576. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USJ3V2408652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4643fe3602612aa1f673110c173d63ba281a1e31b8969ca172246246e7049d3c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTPX2499478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3327953d5c5f3e667b56871ef20a23dee5ae4a0110ddb58e41ec33b57ddbabc0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTVM2408557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd9d8a59aca43f2f39e9942e8cf59ac54d67c7e48c6d408faba2953b26d8cd8. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZTVM2403045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd547b0bcae4db6631542399d43fb0e8a591a5c0c12022fd1e96a2b21961862b7. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZTPX2493891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0850eb6c1264380b32e25cd0b9af54fe20889f6f062d98df265b2951cc7c18f1. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZW9M2443887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c6d8f633cf7ace772df28b2556199693447d79fe8a7d403c4da9c654d0f54a. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZMZ92591815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe954604301a6ba1a276b19348a14ec6f180faf1659dc0ae2aec06c2253096aaa. 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/QZNJV2598596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae95941718eea8c61358472b2099e0962e7fa9a1c7af7250a33ac772c609e14. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJW2572164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8618f274394a8c425b94d8aa57b2991f1ac1f57f2de24add857b6bb39f974b5a. 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/QZNJX2545131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e05d6af08f57c5feb33327e2a79efc7468424fb1e3bf72fe67adb546493cff6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNJY2565754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cf1d2f3df4f1848b479698a83b9620ef0ec4d62ee0302a56aad6b957551a14. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNJZ2514152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd619d7912569bec33b06a812703b0aaf3ec0b3afff35d2917a66c0906d893a69. 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/QZNJZ2505046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1ce6699420bc2be1e3d72982a608f9decb9e4186313f72eef9d40c7301fd8c. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZNJZ2537692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75346e156deaa845cbd2abed3b0345f89c9ba2a692df1bd392d02d4f1a19cc3. 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/QZNJZ2545275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6e3cd4e4312976a27e177ddccba8d661f6d5cdcb87b06605251bfc9a722aa3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTPX2542181.