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 0xd55f937a0a2a9bf4722fe8d568a1760e96258f5a82ea3fffac211501322f4f11. 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/34fdaf5e-56f1-48cd-991b-7eea0a65eeb0.json and https://artists.proofprofile.net/proofs/artist/34fdaf5e-56f1-48cd-991b-7eea0a65eeb0.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 0xb76b07f1ce7cab24affd96681ce96be55b524b16da2b5abd24df079d642a1514. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZK6L2524136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd337ca54fc8bcdb9bc87ba95b56f02ef5b6d5a19032f8ba790fd045011aedf. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZK6L2524137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57490f6285759e497df77b90c335ef69533bb92d45318a8bf336708e8f88f35. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZK6L2524138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd244eeffd121870278771d30480ec42feefbc9cea2afa8c896095deb9d10e5c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZMEM2509186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677cf63f88c0f8f87f2c19dec2b44e96c01a3a6589c114d84a516234263c0896. 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/QZMEM2509187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd4ebb2a3b258bf37de3ca3e1e42e3bba39357951ff7d26a8c64070268a72ee. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZMEM2509188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8173b77194106d896588eda5161558c406dab09ed396b9a3c5819b28cfe4802. 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/QZNWR2521952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b69cf464c839559931f97c14ec30a1ba4a40407cec87006269dd48815574089. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWR2521953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3909d2a4fe7df2d89325b9a160d85baebacc1a36b8743f02738587140039bb5. 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/QZNWR2521954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3493084f034359768e1868a895db88641e0880f2846dcf72ccc5a15b0cc154ce. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZTAX2576819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf101d8e4f3f1a05fe19379f78c7599d674f1fab8e81371d42f68b8d04f772cc4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ772567371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc807b3ebe2c147491dc9ae69795c4d5094b48d798dd2d928285eafa1845b380. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7V2548952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e10aeb9f8c4c0fea8437ee0f81de2c8b1430bf669048eca56cbcb98d1dab3a. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZZ7V2548953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a7dd1db0726286f93d6376ac79145cf632ba63b57baa6e93dafb5bf0d11eaf. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZZ7V2548954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453a8c2997e9da591fa0c1e0db12deaf4bf06da95b7b57a69a9149857ef50a07. 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/QZZ7V2548955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee13b22cf3ceba61a6684621a79f553352c7c27e9a6f516703194726c2826bf. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZZ7V2548956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cea509aefa9f4e5bb3b883e53f949a76ee0641c3b8a519e57732f2e3045885f. 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/QZZ7V2548957.