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 0xbab7282c003af469383b5429b6dacca8fb787bb5f9375fa88f6142cc53285d37. 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/9c2c8433-3c1a-4664-ac2f-b16a98afb4cb.json and https://artists.proofprofile.net/proofs/artist/9c2c8433-3c1a-4664-ac2f-b16a98afb4cb.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 0x8c18a70339608c07696b778f18678542a04a8ae65016bda16080ab204a6d7197. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZES52184713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4f8c534181b50b576ff4346c75f9a904f3cc273b679d760e8dc5a2f8f35df6. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T22:51:41Z), 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/QZK6N2164439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02562f088e915654daeaa9b1db9b358a34ff5c4cb036dbe0a18bd550b3a45a82. 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/QZHN32365834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d918c1164d830e6bbc9f12838bb2983f09cc1fa70f57d64a5a176fbbec65aa. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZK6P2374185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d1d461c1b54093caa5a8a16487b4943ec03cbc33b29ae2d74a4c6a74a3ccf1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZWFM2399612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be940d236806626d30f83e0d2edb66918bbdf2eb1d62852e9087b193c34051b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFM2399613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b86365f50f88c536f24fcf243d34be84d7224be8b2a4acc356cb235bbd4b1f. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZFZ32437037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd85cd39ad06318a934e8c086f4cc4feec4e883dd2b8cd3da925beaca9daadd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ72438693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a47b6f604b4bdb5816fd9b25e73b40565e87e4c0e5fef23dae1fb82e9955c0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZZ7Q2452116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5a31a130714684f4850648db25c9c653b10c86b56df2441d25d7f594554161. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTBA2529008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f31aad4390a4cb5f3cb1af3f9f8da73e8284fdf351397f861a902540a2e3d4. 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/QZHNB2067692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0ed3e8e6890cffe5bcfcf284fe5fb3938b715e2031c40cd8b2be59f02cf314. 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/QZHNB2067694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9014c5c95f12bd2e7d4d685fe37910d379dccadc48606c7c3dbce8f185c6410. 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/QZFZ32362692.