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 0xbc4afc0d25e9530d0985c4b5bcc2f16fa9bb3f8e7d3d0be61f3fd38a55e6e237. 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/7a4a0ca5-aa86-43cf-85fd-d7be263ce7e2.json and https://artists.proofprofile.net/proofs/artist/7a4a0ca5-aa86-43cf-85fd-d7be263ce7e2.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 0x7205e8152b9089b0245bc3eb2b734dcd3ef9979a62a202f5ddc7625ecd2cd494. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/LVL151501389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1264caf2e397a02639b6a3d16f97684f9d719c8474c74362ccba5a047dd650db. 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/QZDA51844218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78a46ff2d4681d4379b7b58110e7a2c7f6b881ca80eb62b6f0f3857a8f9833e. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/QZFZ21900940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154d766b4a8e95a5ec4f139c864a53c52bc26b59735343dc67fd2b0d58316231. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/LVL152400891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe990f747b26dd379fdd006151d61eb78b25cc2eda8f70f384f023fbc37d921. 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/LVL152400422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba53815c53ed542c881bc8171ed1fb9bb5b742f57e8d9be7f44f7c6bf878f39. 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/LVL152501713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc22b6df703ea45f8ae233b54a83d53c35133ac65e8bc32aadd7c075764a49d4. 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/LVL152502330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0df6384771260d472ac6d72efbc0f1e157c8ceab7f56865897d724469b9b58. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:33:09Z), 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/LVL152502328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc22b6df703ea45f8ae233b54a83d53c35133ac65e8bc32aadd7c075764a49d4. 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/LVL152502330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ccc5e74dec1dec3ec1f9aa64c6eba7048d96eb54f07479ee3fdeea05296a87. 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/LVL152502333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba53815c53ed542c881bc8171ed1fb9bb5b742f57e8d9be7f44f7c6bf878f39. 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/LVL152501713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbe5c7a3ec5f368474ba906632539675948fb1162a97627d159df6c3d255838. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/LVL152502332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5345762c65bc5cf83a359f8bfc61dd4c8425ac1c81828add43ed88436171604. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:18:28Z), 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/LVL152502331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4aed0432a39e8f639eac13c5381c72103522741cd27d251a112c5829c0198e. 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/FR96X1962655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4aed0432a39e8f639eac13c5381c72103522741cd27d251a112c5829c0198e. 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/FR96X1962655.