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 0xfe1c469907616cbbffe7b3a4e85ee4d91a7efdf203a42311eb772fb874c52128. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6d3fea3-c833-42a0-adc7-cfc223643076.json and https://artists.proofprofile.net/proofs/artist/d6d3fea3-c833-42a0-adc7-cfc223643076.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 0x2c89c79bc92b980055a36aa8d204c3b33b75e814ede28c623cbf0884720ef5e6. 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/QZZ7R2443568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d7feae131011f9b7c23457fe15327fed4f80c09fe43604bafe46b6694e70e2. 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/QZZ7R2443580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb4bacd40da8308d9f595bc0aea0b4a8c31c9a7fae1d05610d02152d268ca23. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZZ7S2438834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2556c45a4693a366d70200da183310c24ad92d82c10c139366aa9affcbe02c1e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZZ7T2412214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ab011993dda39d95db8dbffe9fa01d584d94bdb05a830625a8c9cfb5ad2ab4. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7W2493999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79877e26cb9909e845dcf5df4563437767d2504d947599928250c8d09a3dcd65. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QT3F32437762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39deccf0f0ec6e7ebdadff60e8fd9835c19a6323faa11acdf3a01eb9935bf12. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZHN32546220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54831f2e0ea0c2c58e5cb8d744e276f420902fd4c36cd5204634021ec1a1a7d. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZHN52576307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae958d39a841ecf3f7196163e7f8b231d261ec28eeaca74d200495491e885f40. 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/QZTBE2571401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc634a9979b0366eb509d31d3991a50b444b7c98fc0244ab6fc6441f38b416f0e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAJY2568286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4e19b4ef1ed732ef6039e01ecf2e5328b33ae0af7de24f9023a0ce404f795e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ8A2545606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fd4d79c1fb1557d28ef10f40fc53ef67b9204a06ed1276fa1eb80f3e8559b6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ8A2545582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85468f30cf4624c20f106aada655cb41b5731a857b195bc5ec2aa60a520c0f2. 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/AZXLD2500121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2368ead6c84f86e570468a1baf925b13c3fd9cd84e860ecc1af8d1f03dc6e7. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ8A2585059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc935b2bc790418b7974c069cde769154a34dff4f76d10d838bf18a66ad62e4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ8B2507460.