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 0x42e5c0101b80197dceea987dd611ac6e245ad1a673dec11a9f3c1418d0eec8a8. 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/2ef5fa77-714c-41bf-87b2-4390b595e5a8.json and https://artists.proofprofile.net/proofs/artist/2ef5fa77-714c-41bf-87b2-4390b595e5a8.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 0xcde4b3dae6f4968abd2112a5b538c3f79c6a5c2e0e70029b027d5a445060ceee. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USCGH1658444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01337087c4363e0dde8db57a39a6eac8bcee53e84fb222d797d93dc184a4b4a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USCGH1658449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1741764cd540ec2724d8857ab46755159881f33f39f39f590d1f8313126b3818. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGH1658455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7575150a8dcfd1e5c9cdd8d6a195afc13e55e12d25cf47bba61d2e371f697e61. 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/USCGH1655758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3482c5356a1da571c1ca8f27424e3f8e733838a994fcfa73683307aca07c03aa. 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/USDY41569419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b42908a36a9342e9bc4f1858864bee7599695cd0c22b7056c478ec9a152e6ac. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/USDY41569420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d87e2fb933c2fc19465a86b8ad3b45b132152724f0fdd7806012c1af417a72. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USDY41569421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1a82666ad82f4d384bb7c06fc3c97e6234c441ee880279e68199f1c8131094. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USDY41569422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79983c9cffece0b2181b0c4a637b6ada203a2717c33b5efe6007115e817c35fb. 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/USDY41569423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1857ddd6dc9fe8ff7d1da7c9db58d4f385e5402dd1f0fee628cfa6d078300ceb. 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/USDY41569424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa152b7341959a02691cf64206ffc1e8f86635a2f15e649d2386b738b4ac2db8. 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/USDY41569425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43489356313c38c527aa7d95b21fec2dc8bfa3e55c8fa652d3be1e6b372075db. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/USDY41569426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614f632ecf8c8430d88d4cd06bf5fcbe36eddca570aef7735432bebc760fea77. 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/USHM82079757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebc9a22254b3724073c7ead914f986f3184d4d33ce8d939e25cc3f279dccb7a. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/USHM82079758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f88b21ad536ee799a3bd7ccb36699b9c5829b41c8322ff62c322f49ca4d4ce7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USHM82079761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e42da12b7193f89d22c3d91b23886cf01889472dc0a6e022a6de78bba54ed2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM82079763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1c6d66962f1acc67e06bf9a370b95523af3357a8e6160a51b81b79e8385dd8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USHM82079756.