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 0x45fd15e24d54ab1daeba0918523c658c6b92f4588fb2256820825aa4aa274c31. 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/e51821e4-2a74-490f-83d8-8bfc3e35c252.json and https://artists.proofprofile.net/proofs/artist/e51821e4-2a74-490f-83d8-8bfc3e35c252.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 0xca5dcf34e4d599e40644d771414a894a0e1cb34a5a7329ff183fddd38fb2facd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZ5AB1707832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89d6c00d92b454344650dd286c119c76d043fa2e4aa4fe7b9159c71ed2bb615. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5AB1707833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ef32db5ff231c2daea9bf5793101127662eb141dec84277246753977c57651. 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/QZ5AB1707834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd6b5658d065cba5ae5eeaae593ecf78f99d1e179c240a44a3dd7350a23d3a5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZ5AB1707835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc9181f5e90a0310790fa369f7ac9c7797c1ac2d7800bdc543000298db551cd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZ5AB1707836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0efaeb7ece28a996079dafdf1b52fafbe069e21eb9b85da1eab9da6ebf3f58a. 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/QZ5AB1707837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61baac4af70b7ae44ce7bb64953b90ccab1380ec8c4bc55b9089329e24c21a95. 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/QZ5AB1707838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538ad80417868db75ff79b7d4183311f0df20034b0426209ef7293e3493fb430. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5AB1707839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d7f650d404548118f262f175a0e7f590c2b2b729b454bddd0c94aef0c75d6b. 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/QZ5AB1707840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3358a71768387aee0688bdb74b3998f20754ea2f006c2806d6ca44db0d4d2e95. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZ5AB1707841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e759ee7f6a1eb9aab8d68e85697a676ef5d15e99256b9ead5d549da4cb973c. 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/TCABL1353924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4423f5a747670c8b459da26bec507c0612db8de12ff559e8f06e9111929ef0. 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/TCABL1353931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c907d501db690d7aaaaa2c69eb5b355202b7e7d0207ccb5d39ff184f54b605. 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/TCABL1353933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b887ba1be3132795b4f01bba0f1127e31c0b3d38bf175ed5f0b03fd8488a38f. 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/TCABL1353935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c7dc407d45b1ea3ab81c64c6c515bd6c43946c756ff0e603dbeb7b07b3a223. 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/TCABL1353937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c2cc751660a75f1407c3f297106e6c77aea3614616c8c491263ec758f00c3d. 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/TCABL1353942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0a1a51290b5f0e1bda159bdb5606e35a1852282319839ac2a342db2680f60b. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCABL1353944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dac5effdb09f39b7abfa97f17865fd2671e4f4c8cbd24b58e852b5b0d9a409. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/SE6HN2384028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4522c41434b4a54f4f4213bd316de1e96a7f05009c23046f4ce5bfdb38d47959. 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/QZ5AB1706345.