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 0xb5d5175965eab93bc7cb06fce563c11dffb5dfa7714832e67813ea725f5ae480. 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/44dd5a37-5c77-41b6-9feb-878e57571d95.json and https://artists.proofprofile.net/proofs/artist/44dd5a37-5c77-41b6-9feb-878e57571d95.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 0x28432fb59838c2a9766bf2b91b19e8a5b04f16d755ea19e032128edcfc9967f7. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/INS180359163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958460636b939f2270bdc835e73e5fdef9d352a8ffb5eb32711487ec61aedf2b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/INS921202423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e72d80bf774d55a1c294635b760ac044fbcd4ee71b4486e7cce0930a0b6f9f6. 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/INS921202427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbadcb430dd414562673230516b4aa483d42ecec62cb023d3dc7443ab503a515. 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/INS922000219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba3225bbe35bbc130b429a24a6ef77762ced03d41f1a409bfce27094b7535c1. 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/INS922000220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1003cf674969a89372f6a896860c17b5f25eb33913fd8c2382deec3f426b4cc. 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/INS922000221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7092c3e9a7f9f459439d55e1d4b0d6a563100c17b7c7078e3c82a8e1fdb75928. 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/INS922000222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a0fbdb3d5e82ae634a76815ed3d0e58db38e010d48e1d08e10d854270c5d69. 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/INS922000223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb772fc13e9278c243927dd71cda103642dcd8f5d5fd7e608360c693eaff80b. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/INS922000224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe75d5f09bcce43363e65e0d1f2e676af9e331d1b947fcbf2e3b936bde2aa7d. 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/INS922000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb049cd412ed954ac06aa6c1738ffa413d740b77d62d31ae8719b8e3ff55e5db5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/INT282000544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2f5e9b83cac41d4768d4537ef823560b5ca2439d3057e4d668b45a09e2d502. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/AUBEC2535846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d97e30b3525dbcad2300e8c6edb804ff1cf329862c7031bc16eed93e4487b3. 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/GXH2J2577324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1f3f9751cd2a7aa014f268ef0f50903bdb308b53caaf091083461e14a31d78. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/INS180358712.