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 0x3b96b9716bc740cb04752426e5bc7df6b392f6559e9a3a819f1d1e92d5ced6e3. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4feba49-4b39-4008-8bc5-9925b3d72f11.json and https://artists.proofprofile.net/proofs/artist/c4feba49-4b39-4008-8bc5-9925b3d72f11.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 0xf5f2aadb7e7c596c6945bebae1a80ef360bdb16a9f2d7890effe0ce066fec12c. 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/ITR551900056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0374dba4b71ac8b0fcb0d6b9a7fc65fbfe569dca84a174c3ea543f9d0f49a7. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ITR551900047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a8ec562d8f20f2d5b120288b10e65da1b2070a67df63b867a6beaa2038c8dc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITR551900059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9a2283ed71262baf45144b4af5c969e524abdf04d71d4169b1aaa2e43eaba8. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ITR551900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31973ee3aa09efbb1a7712b0564bd8aec058d57bd646434f48917561b52769ad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITR551900061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc287c4e83d045e1921cc85f1ae4cdeb0f1a4ce6250d35ecde46a8d5add9a23e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ITR551900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173522c26c014a54151d42514c5d0433d13ae85b21603a664ed0d03fc956a580. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ITR551900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8f9dc2390b26d486919e8e94bffb444de17ef0607dcc946ea204cf759c1094. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITR551900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a8ec562d8f20f2d5b120288b10e65da1b2070a67df63b867a6beaa2038c8dc. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ITR551900059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d5b7168f10fd520a2eb47668d8953e3e2300cb9d720b34199ec929375ea195. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ITR551900062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d706b4c4f936ce535f941741abe47e4850ba536153ea2e664faf94631508a9. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/ITR551900046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c5acb5c199efb073e02c6f126ef65b150db4602475ef416e245cfb9998a4ae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITR551900058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2785f9867eced4e5e1e4930a4caef838609afe58d0008e5fbfa371f0beacc2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ITR551900055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9a2283ed71262baf45144b4af5c969e524abdf04d71d4169b1aaa2e43eaba8. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/ITR551900053.