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 0x443614595a53ccecba8a1431a15be304f11b555903c18ea4d6be1d7096ea8b2f. 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/48b7721a-89fe-4296-9700-9f0145278e35.json and https://artists.proofprofile.net/proofs/artist/48b7721a-89fe-4296-9700-9f0145278e35.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 0x7f36bd078fc1a7d17f54efae79a969937a7a615e420b2d3e19d7824d0bed9faf. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BXF852100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a62ec2c028f685e7bb9ad464dbe71852be8eab18a88b5952d89b7f8ea4567fb. 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/BKNNO2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176449a3b3d2b6d3c5729efdb4a7ba2a07286f7bbeb57346a7a13c2c2b4e7a53. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BKNNO2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08eaff14b585e005d89c3c61ad73130bf105895c0566ce2170b76cf2dafea637. 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/BXBRU1900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098b3be4cc19c7f06748b6a7cd7db73e99470375a36674a8136709a57fee6d7f. 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/BXBRU1900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8d6d776b6eab8bbdd8d06f41ebfbef553f883e16b79ebe8f0c215cf92b5590. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/BXBRU1900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8c30cfa16728ae0b6aac342b5f3b99b1ff1dc4e104122bc64799a138c7b32b. 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/BXBRU1900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbaec28ba39b2a4d6b77777711420067b2075f2dbd73764b71fb2a169bec70e. 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/BXBRU1900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961c71fa6cc801f949794b726f376897994ac1f5179228682e8f5e78b7316eee. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BXBRU1900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522b09d6c7b20cd33e8e37ab8804b863cab14cc25daee48df2b6c9c2ac8a8d2e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BXBRU1900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20132cfc254fb77592803e1e0baa6ed1b5fcfdc12d5525bb58b7fe079580fec6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9L2453363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f48130c08adfaa56846da1ce5a41fc1cef04ea35d0463be026087a9161920cc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZW9L2453364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6717a5e7aa5cff0dff90aeab426bc4d6d7d306140f09735879a76b89726c656. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9L2453365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8d7ec037e811955703a7735eec89e59531bcf14a21ea5ac401928b9ab8f106. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9L2453366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5faf759ab73101927e51050c7fc0ad90b4c56aa49c60cf0ecf2b4f7ee12e2c7. 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/QZW9L2453369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd3b5d3764fdb64ef93dc11aaf660358f3414e135b00f346c7160a5d3a7b908. 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/QZW9L2453370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655e116aa39687f6414b4eef1db1acbf10699e0138f90d45356035f5b19faf14. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW9L2453371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f25ae579a4a114a0b3ee54d910e56bb09081876d7bfb70fdfd45f77b03cb094. 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/QZW9L2453374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e51571ac861130da488be07dbd74607549acecdb810169009a196698da7d046. 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/QZW9L2453375.