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 0xc12dc2b5a5b49eaee198071e9203a72353f4fbf89a219edd7538d548d539031f. 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/da4e8a64-689c-43bb-beb0-75b82163d349.json and https://artists.proofprofile.net/proofs/artist/da4e8a64-689c-43bb-beb0-75b82163d349.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 0x870e19f8a69a5056c40ccb4a3624fd4e6b215543e85462bc1b4e9f789dec8d4f. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZES62550617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a8c671b0472e7f9f0b8c723d4eee58775617c7c18bc492f132c84d97034823. 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/QZES62550619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc0004a411815dcdcd1332c398ac0e5b0a4c7c3feb53a6e0ff9a87cc365e86d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES62550620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a0f9e9c68c52eda94028f511dafdc9074e479c06044ae34397b6b137841fe4. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES62550621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1eb55772141bc64fbdaf7532789269dea20e863224281c4089f4f8e360063dd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:21:01Z), 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/QZES62550622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8beb4d8770d566cd7ec062a9e57ac1dfdb74d99cb476889c5fa97b3a8f8a1f20. 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/QZES62550624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda46ec4dfe1495ee704ea6053a3897d76c5c7e099a1dfe075fb1e565639c6d0. 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/QZES62550625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20ade4baa0dbe08b3ee14d8a622e863971f2f70aff255eacbc84b57b1ccf4cb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZES62550627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd32556e6d9ebbe07674c1586cd37e7b6ffaf178a3f1641be9c0edfee1c4ae8d. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZES62550628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32dbafc8dd007669f922f2d117e0779e74f1c1cd236286c5632a386178c573d9. 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/USAT22305104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ff1837e3a92560639425ca383132718c5e1bc88f7907397ae5010ea3910f69. 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/USAT22305105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9b5b5dd5fbdc8b2991dac0fa0f5053ae8320125500c807ffce406fa801dd90. 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/USAT22305106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fc4b0b10abf2ec88855b9d57ca3bd44744031d5f9e8987a111c31dfdc5e6c7. 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/USAT22305112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043fe1fd6c0ad0d71dfa101eca6d8d6c7a820f8a4c7f41268b4cf09c1adad4c5. 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/USAT22305114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f16e31835ff52e41ad9b058f14854cefd4a978c0baa8ac6b5bdda1903427ad7. 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/USAT22305116.
Wer Lebt, Wer Stirbt, Wer Schreibt Geschichte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d3e9d5f670671a32be1c23014620276141f9786a153e2684a387028b63f4ec. 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/USAT22305119.