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 0x99a8e573374b617cb412b8bd1ef15b949267defde25b032b25084ff9b087ded6. 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/708233d9-e761-4228-ad39-3406f774a34b.json and https://artists.proofprofile.net/proofs/artist/708233d9-e761-4228-ad39-3406f774a34b.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 0xf7f339654640f25732b1a7e4343c57aa99c4dc5c33ed80b4528f706abdef27ee. 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/QZARB1862845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ecdec0b0087da46bf2c4bf1c1345ce5d1be3a37944e5bd059a5c57274b3530. 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/QZARB1862846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79477d7c078197b1fded9475e0f4687040d6203201f772ba67c54c4df5fb8736. 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/QZARB1862847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12d7453148663933e39ab736fa2f784fe3771511fd7edc1a65c8947d8cf096a. 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/QZARB1862848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f66c2924f2e3dc80f288f37c08f57e9a7d0a5f522a3d50d4b0c777747798cd4. 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/QZARB1862849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5756f4a0821b2095858de0fbefdeadd062d80aeda929082180011d5535809edb. 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/GBRKQ2216515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5fb780b60865eeb12acb67a186b49cab93a962a1097b4c5e29089e5e7cbb2b. 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/GBWUL1824425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c02767ac6a58535e878d6483c4e1e47ba45be7bfecb36d66fd8b8111733eb00. 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/USLZJ2182229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bd2d3a24f3b553724f92bb96ed4df363f7935dde2e0c620b369bdad1ed0ccc. 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/QZ5FN1945277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f739825e892b2aa761fd299347deb497798ea48b69eccf3b86f162f7f3285b4. 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/GBWUL1824407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae241188cfd299f6499ab2e1b9d672f8127dbe94fc1f68af9d6305a66076cb4. 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/USLZJ2182225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717e1b84564413d01282cb3aeb506c95210c2221916b018109b5f62cac0620c3. 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/QZ5FN1945283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f989244ba0e642c240b281b9ed518fb2a8f3f45a13f05cb654be9ee6592dc9b. 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/QZWV32396327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693de2187fc0a8dd0f51600cff9a1994484f18877c07fc73fb5c5294ea6b7a46. 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/QZ5FN1863999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06a5df62fb02917be0521d200380c6b76476ebf0c2557590ab767629afaaa1e. 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/QZ5FN1864005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8c26ff818258056ad15baf626ed082f4bd80db7b0617743dd9d8304ab87e40. 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/QZ5FN1864008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7344500528901ecbea403712cf7fa63a3daa6ac3d7302d8d2fda7c559dad841b. 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/QZ5FN1864011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1949d2d3d3c5c3e1498c66fd4a1f23462acb34cbe6188d0f16200ebda94f4a. 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/USLZJ1992812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91a03962b4303a199b5946f4a2049a21d73226729061d1073e811377cc10ccc. 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/USLZJ1992822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143bf7322dfd4ab870545f872eaccf4f2113dacf02e2d8f93fe7a1bee62c2c1b. 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/QZNWU2358532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6df2458deecbbf5f700d4f87e29ddd885afc684d0ed78fc976dcf0d62b9657. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWU2358533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4455782a5bba23d3022b23bfa16b8eb77111dfc11285151e096a3d410e313f45. 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/QZNWU2358534.