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 0xc79c6b70374201c22e115ea14b06b4c3f080a96f729639efbc94b0833a110395. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf96a9de-d3f5-4d48-9aba-12726155ffde.json and https://artists.proofprofile.net/proofs/artist/cf96a9de-d3f5-4d48-9aba-12726155ffde.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 0xcaedbd0e4e1009eaef62f92a1fee7f1fb5fe4ca766791497be68c824d50586c2. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBRKQ2448503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b64c5fad2e051001c82e0b86f9623173100c04d6a764de034c0013d54de7acf. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZZEB2401113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb2fe55f4c903f234ee364c0885712a74dd20a95322d44c60eacaec0832a244. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZZEB2401121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff379d438574200dba907bec659127ae7e06139ff7271f62133aa26bef1d243. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZEB2401123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aebaf7f9b5781ad3e566077b0b4904029b661f6c3cac51a73f9104ba02fa11a. 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/QZZ8B2458011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19dc8788a527b7e18fe30117962418c84030b0aa7f87e346d994d755bec4ec5b. 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/BCE7P2500894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ed168c7a7d63f61035da98b2785754f7e5eb10736fae14f34b5b9ad4f2646. 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/BCE7P2503961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc905a2eddaaaaa5f0ee21588103cea67d97fe4d6630185196b75011f0fdf67e5. 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/BCE7P2400656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10476ba407d745652b4edbb44d4d22d9d0ca072055fdeeed92b41673f459eba3. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BCE7P2400647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926c3ad162594dae5b88cda1ed907c64bde8ccb18f24b74b2a49cf382632b032. 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/BCE7P2400653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300813a7ecb46b7f4eee54d19c36af5c28b330457892f7902f236d9ec01533ba. 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/BCE7P2400659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518e3d09e4979e79d5cbf50375bef4370ae14fe3adc5e05b2eb85fe73804df02. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BCE7P2400655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926c3ad162594dae5b88cda1ed907c64bde8ccb18f24b74b2a49cf382632b032. 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/BCE7P2400653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7000bf94d738d17e97b7c418a86b63ec8e48d09066cbc7bf9e86e96a923938. 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/QZ5FN2469144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067bb7ce6ff5d1e0f667f56ad954ddeb3eb7cae1e2d7ff543f2b9a4c9ab88439. 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/QZWV32438111.