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 0xad654161ed95378debb780d96f443ab66f136078de73697b47d2cf1afaf8edec. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d01b895b-4524-4576-b0df-cbe70fc277b6.json and https://artists.proofprofile.net/proofs/artist/d01b895b-4524-4576-b0df-cbe70fc277b6.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 0x2d3170a6b46e606c07390a19235656e0ce242c8a31adb3195cd41509d1cbd2b7. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTBF2461608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa119de9535b9b3c206e50ac0fae00a6b4ecf5e10784f9e54ef1d123b8524928e. 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/QZDA72593941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5c0dc75ba83acf9ae1f5a0ccafc0136ffc2d0d2da0d46a76d1826b807f3179. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNWQ2513023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406e21b25f7703e59a62f68f04229da057a459d784a2896ff3626ea7e6c7df87. 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/QZNWV2515371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb3cf170eca0bb91661e64383a091ae812ed104178eac11a74330662f82658e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZNWW2545063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296a03d83aa72dacfd180a1d60e9f63ee51771fbb0db6a080e1e93304c15e8bd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWZ2513861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fdf0c410bd2dbc75c361987e653ccaa42b28d7e9190a169b587c05284f4be6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTB62559162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65d29e037161d6e2703e7352bc698734ba74c6e6ac7c3a804805196688f3feb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTBA2509969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62276c5a81a016b9a6e858ed284cd215675dd5c032bfa538d57e4677e86bf6b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFG2561747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6164bbb2a50e0a3059b7591eb05f970ce3c2ef21462f36a946d176232a093c0. 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/QZWFK2548660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a25db561ce4fd2f30ccbe10828d94bb282cc345a0e368b7783c37415bbce914. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWFM2526992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc9bb1caf33307eefd9be784fc6d7954da01cd5cd6047c6b6e60cf054fae277. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFN2570915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2988e6fe5db5118d194ab75d234f8cf98c5331d6992cd949b7a0af0c9e9d173f. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZZ7P2503231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07dddb1230804773fe39cd8ef367a4da6ca047544a1aa15d024d4a02d4d4cff. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZZ7R2519384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0ea56955b0376fbaf6f72d44b018b2fc1acb1de618b62b0af74286bee6e56c. 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/QT3F52572993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dab59977c23be517659219d31f896a97bad678868b4a5a3c00e3a8147dbdfc7. 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/QT3F72544016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef9cb572e0ee7905b44642aa52d6c5369fe916c7b6e257056e46583faab7ad6. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3FF2504618.