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 0xeaaa2b7c011f48dba5d8788255e2f96ba074ddab1719cc7ef832947b7180f6b5. 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/f4d5223e-8b03-4f70-8870-f1c8d6ffcd86.json and https://artists.proofprofile.net/proofs/artist/f4d5223e-8b03-4f70-8870-f1c8d6ffcd86.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 0xc6356f5061001fa4c2d645af03a11fdebf2801da3497c93d8214821cd28bb45e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USGKX9807502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e249e9fd7803d66c04761eed4be0718a8b725752d5c2c146923c4e6ab3107b. 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/USGKX9807503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce691dc15169bdb6925e0ca5fb42c592f3afd5f5a6c03076baf8c0b8afee04d. 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/USGKX9809504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a929f0e52ee4ba65bb5e7578de4b7d9d511e176235934b8e0af160a09c25fd. 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/USGKX9809505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da7b003effef55c363f841f42c65c08acaf1bdcbde96c382663a0957be2fcf9. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USGKX9809506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03f8645dd87f30c6d081be5a1bc1a4ce541b53aca65f43fea3a00f32303023d. 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/USGKX9809507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ad3072db6efb8f696c81642c291154d46e4deb79929b06172be605a1600c03. 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/USGKX9809508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa556982226842d34af4600add7160f134364d86874678714410a0196051a74ae. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USGKX9809509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6138b92cb0f5ca1665847c2fa78cbd21c129bb0b385f21daba4c6636e009bff7. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USGKX9809510.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74c7169cac5a60e7ab2fb70148e3b3481618f35d398c8a685c9c0636c2fcd06. 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/USGKX9813604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1daeb332719dd77aedc46a31e7b753ca47e3cdcbfb8192b4fefc797a9f4022. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USGKX9813607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d64ade1f0a26cfc68a559852266992463db6b7503e09b96e37b17d27f9f3de5. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USGKX9813608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1b60a84b0b4aa1bcb3ac16d8eba539948b8ef4e44afc9ac62908e234c642a6. 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/USGKX9813609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe634f7c9cf9b3a2c6c84812236c1de4d236d00087b14ea235814881cfb32464d. 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/USGKX9813610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf041f30661b5d7c1644514511b9226b18a2b108794daf9112be8cebe6e33da90. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/USA2P1890729.