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 0xa6daa0b5ebb645cc4dab1a64d13df8f4a7e57f1c4a1d2d31ddf7a115eaf208f0. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5892880-ac0b-4d6e-8ccf-e2223dd86d10.json and https://artists.proofprofile.net/proofs/artist/b5892880-ac0b-4d6e-8ccf-e2223dd86d10.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 0x5603d74373b0b8afde353b2e6bf909af773fa23dcbe21abe247774865ee14091. 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/QZVEM1818868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5ac21395c9df66f03002428b79d53baafd233f3c14302d22a73fe07faf3e4d. 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/QZVEM1818872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2270479aeb3fa24a85985e22419f33b22faf519e7474047011cd6418f77ce9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZVEM1818876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09546f03158c2e6bef393f675697c79fd4262c7500d7626bf87d57db52372ac. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZVEM1818880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f48b2eef8484dcea6fff90ed072296d3e5216b4ec79f8905564a6278460446f. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZVEM1818884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd62a7d15ae6cb4be3f7aa18d38edddf93bd28c5cd24d58b89f402fc0c56fcb6. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZVEM1818889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa07067e45cb15e730be25ce2ce263f9e316352afdcec52a775bd4e10ffcd62. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZVEM1818894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f0f31bd6c732f30025780c2951eb3c5b2ec926f738ca9f515051ed174ccec7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZVEM1818899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3e0c1e04a776c11c2f25df7f82ba874e43ac814c431886befbf03e3c0d2f38. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QZVEM1818903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce355454df26ccb972eca82ffb4f26815b2ce8e236fb0cb3865b9320ad60093e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZVEM1818907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fbfe7e7a9523836bdc470757c87ec56a7cf347505f0e691f1af2b9e81df873. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZVEM1818911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5ebae94c6796cf40935848a8a2c5362703392d3e2c08195be4f34f350ed149. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZVEM1818914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a484279d57969c9949d55d04cc41e33dd9f43cd9761e2002c68db8a8c09a91. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZVEM1818917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1cc6a121fd9ef0d66154a4d5a9156718c85af3e454db2a57dacef057edba11e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZVEM1818919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0c39de4c358f6a5fc5adb0ce828cfbfcd6fb37c5566f2d744d691be3918445. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZVEM1818921.