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 0x6459dd439fa546e340a44d7d6d10a1fdf7d825f12d568411f9e14854aa077d3b. 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/0740363e-6ce6-421e-bdb8-fb5188a40321.json and https://artists.proofprofile.net/proofs/artist/0740363e-6ce6-421e-bdb8-fb5188a40321.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 0xfab6901c38a2eef5ed1ad88cb1ab4752accc727df268a34361f9a6466b87ec3e. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZS652132159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697db82d5e4980036d3912fccbfc679904f5a83fa943fb0b6bf6272b56e7bfff. 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/QZS632133295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc615053e66dead77dd70864dbc8705dc5a9bd6456f34d3d8511d619bd9074c32. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FRX282275837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8d6f34d533d10ffbc9be0899b94409834827d98446c7f9d0ea630750557ca9. 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/USANG2218777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27670d41fd5d95103302f34abb90d9cd0fce4bc2a57d72474178450ae1808d8. 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/USANG2256942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2782af6a162220e003d53d63f739a9d2d8c11c884998f82583bdf2ab6ae9bd. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USANG2287932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6186d9a914962a42411c2ac6cdcdb85b94e5dba18e0b1a1639b4df49824e41a4. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USLZJ2396704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e901899bce9b1699c7ee267df697f7214d768634f90e37f3b50d13b2e896c7. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QM3DF2272002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2624595584d13859482325b7608faef9074fcd857ff7a2b10b3616d2070754c2. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QM3DF2272001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb80af900a54973f3c6267502002311ed661c59f5246b5111fb0e45f9d565820. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QM3DF2272003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe059df716e7a9a042fdd6e31216a026a0065694e9999d699fb6ed0f15e4eff63. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QM3DF2272000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706daad86be46f14b2f3bbeb53fe7a7866607820d232c0eb7fa552ac0b87224d. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZWDD2385694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a10cf7dbd3156c47b143a631b0d8315fb023e71f30bb556ba4612df3bd81f11. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QMANG2227848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc4ba6924e7c7ab633d315d4daad7c8b075f4d7db5454c3666f041d57d0623c. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/CAQOI2306271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f78b4ae295ef40c745180e2b71d8d177b832997c86f1ac9544e9a20bfe8576. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZWV32475760.