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 0x4dc724213a4a3fe1e55354a78b276a95982c391e2fbfbecb8d56367503ad98c7. 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/c46033f0-e367-4f38-8e4f-9a761c4d60ea.json and https://artists.proofprofile.net/proofs/artist/c46033f0-e367-4f38-8e4f-9a761c4d60ea.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 0xdf39693a5facefec1f35d0188c0be85773c18ba071aa05801b4f6103d3ff43b8. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/FRS182116468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174a5406050b044a21fcd4b426ddff833c390a79eaabf2f65bda34bd4ee24d3d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/HUMAG9800247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c99f98af74f9f0d4b5d517ede1a796f3a7e337ee68a911467de0a09daa9c3e6. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/HUMAG9800250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f598afe6797d6d9813bad77039c54c3a661a6a6d4c94736acea82c23ba8ac7e. 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/HUMAG9800254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb113c81b47e6ba8e85e7d0de8924a62beac273e945afdbe413594ecfad7949. 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/HUC302000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fe33ac0c1c8d7c300ba917bc6282eb62e20bd8e23d380a0786937dbc346a13. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/HUC302000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709165a8c9ba9a7419f410bb3187afd9237715ef44fb5e30dd8d9d325d426738. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/HUA631601247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eca7f9f7ecc457985c9034ad727f0c4b9ba9b5e62c03bc74a0737deee46d60f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/HUA631601248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612d20f4ca8daa4bad0a1c3625a388d5b300623640827dfc5673cd1aad8022ce. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/HUA631601249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fa86899306d52e26db73c3ca36f44c2ad1395677bd5b78c7cd0e9e7f6cd9be. 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/HUA631601252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa965d88158830a81d64b4bf64befa53280b14b9ffce051b33e1958d5fc0405c1. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/HUA631601253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31118d9a08963b3ef71498ff2569ba1d16e3542cc6bfc35049196446988b6d63. 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/HUA631601255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c807286487b5ad05707071d727ed3ad15895bad0c04162a742bf238ab638f63. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/HUA631900254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fa6a26d7d707980196ea4b5b9a9483a16d6896d738320dc8a556c453b74e10. 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/HUA631900256.