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 0x93f7544ce89336981886330e48fd0bbf92e6970a068b9b644379e1ffb005c89a. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4482c87a-f839-4963-a4f6-47fa13ebf803.json and https://artists.proofprofile.net/proofs/artist/4482c87a-f839-4963-a4f6-47fa13ebf803.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 0x40c8078ef886c3756ea7b6a198e39166ff4b3029ea6d8c09101d27cd23a678ae. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZHN52131254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe323dbfde7374fdce46964ad4a97a5c684e3cc6fc9e2127d23dd9bc88f94484. 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/QZHN52131255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaef85b4f982b605c82525b1b1154c73ff8476fa01c8de327b7048c3a9478d10. 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/QZHN52131261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f947e2d6b6c21c29ed93b2fa9050dea26c94f4d95f86cc8db6213ae0b87edb. 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/QZHN42177688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379df910d5318bb5835b1e2e43feacd6634af43c41dad5a7320f1f1a67e631cd. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHN92191357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2775907509520bf9b13b8c30f4a445adeb6b81df1d5a951a2e06312948752ce5. 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/QZES62206900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ab97e83284154076566bacc0929de3448474204f4b5263e0cc9c1487c963e5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZES62206901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e776311dd21d821c99d40f9e5ceb716e6d161546067dab411e1ddb9095747a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZMEN2373030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfcf8c00aa9c10e89cb21fca727e74ec8ea86f1f6f34680cd3ab65e1693866b. 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/QZMEN2373031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c5e7a68a150ceebf1f5cc326b916682cb958f90fea57541af1956e58140874. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZWFN2341357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf515a13d8232fb4aa769c0d60cf5f8eccc252fcdcf00d41abab91cbf82ebfbea. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZWFN2341359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b90b8473d0f460ef6cbc8f9e3819453795d24c2441d4ca2902adec804351733. 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/QZWFN2341360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0458602873d4ffe41f86a0a48653391808a83e389c12aa3b33e82960dc975a. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZWFN2341361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b00d6790bb27c7473dec6b44f5ce03774f8397f87ddbba903996cc766af87c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZWFN2341365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971f4c5d76f77b38268d9f94690acaca691a49ea854875833950b26be6710116. Chain 2 (Bitcoin): anchored in block 957566 (2026-07-11T12:26:02Z), 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/QZK6G2414401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfdc2a237a98817fda897504c6b24f6cd25ff206fa559e42fa2e968aed02ce4. 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/QZTAW2431168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa555003824dabea5a028136732d4ca0466ce3932eeb446dc369114db6ae63fde. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/MLA0S2500001.