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 0xd370b491e00625edf912ca7304c14078c965f0461f3fb0d49209682f6ab6c444. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e39457d1-9b7e-4ee1-b6a5-b38cef9db41b.json and https://artists.proofprofile.net/proofs/artist/e39457d1-9b7e-4ee1-b6a5-b38cef9db41b.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 0x8b6e13be439a1c99ea7ce2236c351ea5797c4219fe065a24bf1a961bfd63e355. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTAS2551413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284c0ca98c6bdc2e87a9f3718b2ce7f469bf3db4b0c55f36691bb8f80452ed77. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTAS2551414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f5aae85a60793201dbf38c107ed4629db88b3458e7df7a81ec59ac45d8e069. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTAS2551415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6739800051d9d2996e6d9e23681e2501b3441787e4231f9a252e5a09d562a8. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZTAS2551416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840d414bd4d83d909bb2976fbd17dd947ec47a2fe62d77494ad705bfcd3abc6a. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTAS2551417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7115a883e7d33ff22bc4ee92288a201299e184e601c38753bebe6d8d3e252a. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTAS2551418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127dbcbcb800eb4ffdfe196f2e86bd431afe7667abee943687ae9146fcd2291f. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTAS2551419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cba37b81dab24a7ed34cef6bfd18c3651ff2adf76fcfeda4dd986568fe23423. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTAS2551420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc338d6646929a4234737c02de4efdd4912f1d95d0eea3c9b6680891997300ed4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAS2551421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291c85014d048261caf6d2fba66f11e3e307d3299130aa9fa3b63bd2756492d2. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZTAS2551422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbc03cd72e84b9286718552d95d9016e16deb04d4bb67fdd0178b14e976c24a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAS2551423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d9164e0e5c1bd0fcf128118cceeab3feeb8744729a811263b55e00d4ab508c. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZTAS2551424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80333b2cc94d7b8f23e77c01b2d5805601a05c99c95407cdf4cd8c66441c5e8e. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZTAS2551425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9661c22ddd0d7f1d16422a774b5b1edbd8caf0d43256c8db1a0b6da2c6f35db. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAS2551426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f938a10471b1063f81584db8d5557a63c801fc0b61e90df4a2f6dd21dd46e7. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTAS2551427.