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 0x8c87d82f3c73160151312584ca8b6c9eb4c988505fbe41a1b7ddbb826b804ab4. 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/e31515f4-e853-4d72-b0ed-03d6d4a73784.json and https://artists.proofprofile.net/proofs/artist/e31515f4-e853-4d72-b0ed-03d6d4a73784.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 0x22d8db5c3d61b524b4f68f0fd00b351b9003d3fafd2949190ae6136c99cc0198. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTB82247826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6890848ac99d23bc2e059e32cbd2c96d0ae68d1331f13b8af3d11606e1c964. 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/QZFZ32337375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe2d07aaed7e35c56f19eb75cd0310c762f6a7bf71743ca9b2515465120a404. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZES72357913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe2d07aaed7e35c56f19eb75cd0310c762f6a7bf71743ca9b2515465120a404. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZES72357913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c0c85dcc7850586c6a5a3f5d9b5c1cbd04ee5d583ede3ba2a8f7643123af92. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6F2363060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef26ec69ae70479c7e05a28e1f821da37a977052677f96433327b454dedf66e. 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/QZTAU2355004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f73acae86e12dfe662bcaffd80d40bf18b1e1a46041d950ead511f57c993e50. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTB82364390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f73acae86e12dfe662bcaffd80d40bf18b1e1a46041d950ead511f57c993e50. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZTB82364390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f0f81a246946e72205831946e4e70ce03f822183217ca3e67cd8fe4ed13214. 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/QZTAW2262383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd9c2361753534d13fa718e9a01c795b62be9426a7a9dbca86d51bf029ec08d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZES72438599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59caddebe962276b83a605aba768a9e069a3d294cbd1b35e7c321b0af638a444. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NOX8G2400375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89972fd3765fbc862264d9c949e423fd621c2cf5cf21b63805dd79bcb66c8a47. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOX8G2400417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0192d7a0ef5bdc34891f644c9dc65a5e9856a37619d90b52678db7562571661f. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NOX8G2400544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2971ca032f9da229cf4e614e7c88fe2614f7fa858d105005f97c80e7b42fe65. 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/NOX8G2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b08736db4583a84c5d855b952660d5f42097314affb824c386308784bb0ea43. 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/QZES62204294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a3a921b68a79426a3c412512a05c6be3177bf1da20e8ced9be5284582f0b22. 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/QZES52221282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b4d038d4927d62a4a3b546e8890b6ef053e01c38b55dfed628f08be95bb777. 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/QM4TX2502277.