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 0x5bb1a2f795fb9f847670f5832fe745841e875cb7cdcf6c0f6dc5c76ab39ead80. 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/b45a6ba9-c3d6-4171-8a8c-0c33f90fc618.json and https://artists.proofprofile.net/proofs/artist/b45a6ba9-c3d6-4171-8a8c-0c33f90fc618.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 0xb27dcf3d0e64f9f33821be4ae852f9536e4a674558098e1eef6651a4806a1b2f. 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/GBSMU1767415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf39fc31eb8b43e654e8b85ce325e2032e696534557a3bca58f0f4d904d8319. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBSMU1849629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24dc54c257766779b12a0e0e082a1435a5fc3da16bfe9558b00ba134e323569. 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/GB2LD0901856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf620b1c3d411a26e4f8d9696ab3ff85f84b6f0f40023db91f42e14f968001275. 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/GBSMU2001013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ffe1e79adf8b5b1355f6af62314416f3450988686e7d700ee48dc33d0ccb4c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBSMU2058041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c093fa241a172b56a4a6c05571bfb88e1541441fa8a1573da23fbf36435ec0. 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/GB2LD0901987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7152eea102452823b5d4b10086b5b1fa36acc272fa475d967f2928cd25d5ab1b. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GBSMU2194637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d21116e6dfcf799bfa6e0900e66c6100fa78f0d01bc74634db5d4687fbdf804. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T16:05:58Z), 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/GBSMU2374514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96138bdd77e87be44310d290805c47319bc87ef235dd8ee22ab0bc27b948a808. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBSMU2479385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa68f40e20924f6f5d22d9b46e3438efe82d0513891a4f72acc9fb1369cdf92. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/GBSMU2479386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce54490eabd0ac0e9e21c5a852f8ba40e20d176ba13b4a99df8fba75feb975ce. 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/GBSMU2479387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc42369008fb89eff429aa91b90e8bf7f51f56cff4f6cf35cae67983c96ae5b. 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/GBSMU2908443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cde402f8c6052f73fa423c4a287d0317587768d97fd060aa7e992e80167eb05. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GBSMU3177181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e820747147aea020a36f79e691c6892b2796ad4f6b85c2b0f7dd6411738c8bc. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLCK41056770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abcfd24e5f76342af9d5a4817a57158e51c9b4adc878e134ad54e376b7ddfaa. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLCK41062201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557d4aa1b8e0060d8bfd2100c98bad65e00c26a04e6529860c14d35b873d8d99. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBSMU7910628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf9f530b63947268c6a4f1dc408fb5eea4286aa5e0dff4b11570d48cc9eae40. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLCK42212998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d487978b5efdd2211d9b74ba0f7b9fd81cb31f4a8bbf28b42d72b880779a6b. 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/GB2LD2320188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0179d803509287122f09d9e034e0cf7c8a2c9f8a4e9315491228302977f210. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/NLCK42416721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943b1c9427370dcf20f2737123193f7b24f036133d975ecef8b18690753f0383. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK41072240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fcf791bf773528ebd03ea2cc019b886d8e8b484a6a0c7e70b8ebb10cd495a3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GB2LD0901805.