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 0xc089677578c709c3d5473f594131f27bc1784e91a98a233dae004f45f64c2010. 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/0ada9900-a9df-427e-b5f6-eeab6555ef0a.json and https://artists.proofprofile.net/proofs/artist/0ada9900-a9df-427e-b5f6-eeab6555ef0a.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 0x5022548b68c042b327acafaf5858e0697689976b84a383317ac7d039ed2cfb60. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZFZ22151394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdc1ae8fe9cc055e3c15882d1a934c603e36bfd2c6841433cf4b710a74ea8c0. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZDA72155804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc4223cb53fb003f6d5654634c8cbf02831d84815ca31cd55794c66edcdf6e5. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZHNB2158339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66eb7b0eaae50a2b1781a233f5027cd24427981b83caea4e9d09b5eafe94ac2. 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/QZK6Q2156615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b2e4be51d93c52dc2132d7aa7c6dfc41a47373ead561a1375c4816c337e18b. 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/QZK6P2170663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75eb62f8760529eb878d8de1cf4158e130145ba41d1c30be32a5f43da3d8488c. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/CZUM72200344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9d8e402dec92d492bed228e2724d2dfb3a787c1f62d8b36f1ecfe71e032d9e. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/CZUM72300459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c287189ba756614e162191458e540fad29464dd3493ae0ac71cea6b92e5982. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/CZUM72300514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a8a22882af78754646ab510ed38da793d3b9b464bd1e53e4790643b2422d8c. 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/CZUM72300515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfee504d4b77d385eb541e96569a5f759c220bb6cb2de700f1480ebb8b8ccf8. 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/CZUM72300516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9557552921b0b27c5b78aa23ded0232ddc94e7c422e8627eb604af59633bb138. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/CZUM72300517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc52a8a4da4361944df32b8745c2b7b643cfa0cdc11d2a9f523ac084d72138e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CZUM72300518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482d04366c231ed834bcf9dbb7d329b26b804f9143df99e15a16f960f27354b2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CZUM72300519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2127a12dabb3bef3f1ac196f6b3706cc8b8fc28a1199f8eacdafcc8ab29efbfd. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/CZUM72300520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0b24a21d02ae9d5ca435816b3eaa6054de71f6d121dc745c5292fb524bd49a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CZUM72400246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e8ea8f3f05efa4e28f84b9800ee5937f7baef46ddf752ee33429628c6d9e3a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CZUM72400247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa037b8561c421aa8f709ab6333e5fb6065a09d841e49ca1e85e619c05a645fb6. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/CZUM72400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c33ac8ab58bed740d6bcab1900f4254791a1c20969bfd6058776ec05b3e4cdd. 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/CZUM72301388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851759cbdc9db3a5ebe6964c1af732b50d6c5d3aa563372239bd92d5d608232f. 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/CZUM72101048.