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 0x07f55ebbc546f9eba690847c2556ace3361e10e079984bf28778a701f7f716ff. 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/f2ff0503-cafd-4738-b4a8-97731e502636.json and https://artists.proofprofile.net/proofs/artist/f2ff0503-cafd-4738-b4a8-97731e502636.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 0x4114f4b2ebd82fe1832da899eaff90c3bbf558bbead0710239830a296c8bf4ee. 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/TCADX1869430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544d3bddee62dc6899bcccbf4688327acabd3eaa9b183f926f3464ed467a63ee. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/TCADX1869480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073915b294bff3732f69c83dc497014dd83dd04197ef4b9bc27835c3e4074f0b. 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/TCADX1869483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5a709f19ae64ed8da2f6cf9ec3db1bf6542bcc00707d57feefbff5bc32f0e0. 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/TCADX1869489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd280a8aa1188cfe47578d40486374768a5cbc496a745a42c0f4c84bb6a34e2a1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCADX1869514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f0ef98a6e8ac73356069a19280123d457ab673885c4a60ef0ed9233b078db4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCADX1869517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880d562bdefbcea3a954c5bcaa2acad33c219e36dc0c24fdc31010c64c83ceca. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/TCADX1869520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a7375fdfd2bc7d644503fc6925b2552d6dedcd479b7ef91d4805a310a98157. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCADX1869525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5df9d6b9a1e162b0984023ae68249b2e681085130cdd90a978e6dee0e40d90c. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/TCADX1869527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27cc3b5e0c2493002ad8e758cef891b579ca26e1e8e906a2ad2a32310dea7b91. 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/TCADX1869528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c4508013509094a9d47828ee23af8cd8b6c7c360e6b12b8d773627f6f0d2b4. 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/TCADX1869531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e420947cb1a7583ffaf2a1e419723899c0bfc5928a3ac6c392ae7f9b13fca3. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/TCADX1869532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc620e1bbc156270f04fba28005506336641193a46835bef05ae7c25ef663179. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAFK2153074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d953e289b4f7b6cc7b0f2813a406a22df1cb6418e803520d7305b72c242117. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAFD2006970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004552b07695ec5a11143582c8f93496b3fc75c6031cabb65b23a2b2c8f7d7ba. 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/TCAFW2178130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ed98b1bef1fc537a89c44ad61dd29995821d60c6fc951128303a68b586b382. 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/TCAHA2337274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd16cd8f2537d23ef45fca63fec3b745b9446987c4d4d3300ec72fbdb6c6d8c. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCAHT2497637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4e86c57df48b99236cde66898fc6ecf17868f03481557c09c1ed9cc2fe6ecf. 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/TCAJT2511757.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734abc832f39963865cdd3b550ad5c46d0f26f1390cbb36b1e8cf238504c3a32. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ITAC21800089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6762584a9f5bfeecc6cd676255ae5d9350249090156f91aa90ec09b38d4cab0. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITAC21900023.