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 0x0a90e06765fd4bd45c2e91bd1a0dfdddb3883229a5a442163a52e6ef0816bb01. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76da2ee3-527f-4074-99df-853e3f3d8df3.json and https://artists.proofprofile.net/proofs/artist/76da2ee3-527f-4074-99df-853e3f3d8df3.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 0x8dcaab8e070ece0f9530cc0035ea47485c4dd80b934069b8a80e6f124123b6b0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWD950624101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5449799b62cfc86333901ed4c62f5fec3b180d42aa73a089119c6794995e74. 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/TWD950624102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7ca5e71a57202acddcb94c26fc9f818f3ef6406568946f5457cc51f8d314b8. 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/TWD950624103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d2ee86f75e2c71a6fdb9a2ba2fcd3154c442449dd3025f236133a546ba4c68. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TWD950624104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca298e1cf595d438606f76aa99db59e375e7eccd5f8650fbbe14092e330d8765. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWD950624105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f527e608f91e2cf03e1ce86b8618cdca88400cb4966ae1b4c59e108b0d12de8. 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/TWD950624106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d1b83d15cfa0dca389813ac6f8ad195e55be6ee6150c5b13c37e94d31b080a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWD950624107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9210a0ba2289184f79568c46ed0f8323866856c9c2240f7e04ff176760f1f0bf. 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/TWD950520101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec906a7ac05db3e6da2b6d04930c318feac92d897b38dc9f68543d6c434758de. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/TWD950520103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b72b165884d129d3dfd61949795fc3d40467095d1e02f617491a0598ca24d9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWD950520106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bfc81b40cce870ec607a627d5cafe7a4589575435064781343a8178bfa52e8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWD950520107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0bbafce09d5d79cba3ec3e223cf0d4437d7046800e940694ed696ecadad4b5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWD950520109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c16a07ba679e2b7e80b5b1074e0272dfde5352c73740200f4e90e632a68ba0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWD950520110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e58a071508d986610d4d26f2936f2129063494cffeaec282be8d89335a56c5f. 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/TWD950626102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b0062fbd370d119d271c14da3a65f31f06764c9d6cef8fcd540da33e4345ab. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/TWD950626104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f700bbd561a383606f905afa3c66e473ee1a2936b5301b63f342695729689fd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWD950626103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59121a431d711abb5f661b6339ad49eb5fc303c042355fc85ea1370fc70dd4e1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWD950519101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac6062ca6cc0895e9e2370ef4810fe6476eeb49793286fbd75d215ac89b8c93. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TWD950519102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589fc40ef1b644d9fbc63ba2dfaed28845f5578bbf41d920ae27bb1edb06724e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWD950519103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c38682a97242d19422fe7a7fbbe909d79472fe3c4233b985dbac41fdeb5017. 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/TWD950519104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff318fcb27f44a5fc0cd94ff6be9a3f36c20bec5e1a45f9483090d55e5c78f9d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWD950519105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcba3a06452a4883fd59f2e2e846eb0916dfe90538d981e78ef5dd305899a71. 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/TWD950519106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee4a2a3efa068453bc1e59c4101714ab52bc247e7f997792019df58650c7ba5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWD950519107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358666136955c4ea9a002eed3906879ba8315be66e503e891bdef8b1c794a88a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWD950519113.