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 0xe43f4d34ee257c7f038be0a52e623631f214b1de686a790a2c681c0d64982d8d. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6be78724-88ea-40a0-afd7-c7a21b5f6623.json and https://artists.proofprofile.net/proofs/artist/6be78724-88ea-40a0-afd7-c7a21b5f6623.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
"Looft, Looft verheugd Den Heer Der Heeren"- Geliefde Psalmen, Deel 1
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 0x3faf0e5ff13cfe77e86adbc067c0dc3d8998311601b1acc87e5dc37e48d768ad. 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/NLG620588319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7950f03c7ddfed82b8df0d7e530ddf4248e058182751a42d8b3e6dcedbd7c3. 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/NLG620588320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c74654dd8b89e6f5980636688ea0032811d0574962ca5123c9c22decc28b2c. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/NLG620588321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf238cafff02f4cc9668d357cdbb9a57fdaa7e3c0a432904924047fca6110fe7. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLG620588322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb47f84ac3aec60a2741650f72e81a980c12c9b21dd328bba81de770a6c88ce. 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/NLG620588323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae4ab481fe131f9d2dd1c93a36580d588c79bd6104a72dc37ac20b38a8b294a. 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/NLG620588324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f258bd7d67f7b910cb20b8d05600ccb567d42f78285ba0e940f3f59f419da9d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLG620588325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f322a14a18e0a4ea2b39a3ca23b8b215f90c9440ef12e5c3d11ebafede80f0b. 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/NLG620588326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d6237653fb81ec5703422288d78721d05f692493b281c1370c05219aef8fd5. 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/NLG620588327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b713ca28bfe581933f40d5495c810d84257a481eed68cc5ba44bda8c7b6095. 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/NLG620588328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312efdd83c72cfc7b144df1eed23e55f5550a5fcae5af2325f9433b223e21a61. 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/NLG620588329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f14f5cc658881c7b312d2ab4c952f0c7846e2831e5037a1cb689e7dc3974b2f. 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/NLG620588330.
"Looft, Looft verheugd Den Heer Der Heeren"- Geliefde Psalmen, Deel 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a063fd51ed6c11ad53ce27d9b42b0bdcc369f803e8ecfca04c0f6ca264b14fa. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLG620588331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb94559c8292b826e5e63ce87e6e8b356ea54fe8c71a8a11224b170ccf65cfe8. 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/NLG620588332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d77ddc4acb337837ee4bc2683e4c835da67bb406d2dd3d388ae6917e8c6bff. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/NLG620588333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cba431951f19cb0b56419f86c0aa354e9577243b74a9285f07d3e759aeb1097. 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/NLG620588334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272983cb24873443154029f433ce9c8bcba84ee1927bb0fc318925cb2fe1058c. 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/NLG620588335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804501e943ff7e4668cfde83a7b5cf8b95279cdc2ae58ae4c5eb8e468b7be209. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/NLG620588336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0001faea2b057751d593eb34e170fb8b961d0dcf200351f5ff804a2a611bb24. 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/NLG620588337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacaa85a23f3a2f33b56fb5af45d26589679108d35c6abb16096fb9bffadd7e2b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLG620588338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd4c170fb1099867ce682499d88582e679efcdb4d3be1af266798384915ca38. 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/NLG620588339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d35f640c84b826bc481321a1f2f4601e40bd534699015949dd913ac8dcce26. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLG620588340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3953e08436e1bc998cf9f9c5cc3f7dac176221fd2d5cb9bdb4af01bc798fa2f. 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/NLG620588341.