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 0xd9e9081b11696f2a3cee6c8675817afb2c03ab785f1891f1c2cdda18793f4111. 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/16e28add-c364-425f-bf84-06632a5fd055.json and https://artists.proofprofile.net/proofs/artist/16e28add-c364-425f-bf84-06632a5fd055.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 0x7ddeddbb9f2756fc6e0c1674c95bd3e27a00aa2c08952c5528ee9b3c46e25eff. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/TCAFM2135152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8633ddf93894077aad88718b33dbc118f8ee02c8c387b898d7878ac34b19fdf4. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAFQ2122481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a3d7a9f7b14a078522849d6fd6e7ea776244b1d2b0856b54240222a7731acf. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGB2202947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fa5f88215cab09478765a16d3dcdb2e311d081619e1cfd43a7c3d4d6808259. 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/TCAGD2265461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fa5f88215cab09478765a16d3dcdb2e311d081619e1cfd43a7c3d4d6808259. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAGD2265461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d9e36588cbae5a14d88dbe0c7d9fe19865393b0258f136fbf336a90f717b86. 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/TCAGI2282616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5203dd6ee4533e0375c6a35795f6cca58b989034686f34a15f96f3234e19b995. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAGK2210276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5203dd6ee4533e0375c6a35795f6cca58b989034686f34a15f96f3234e19b995. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAGK2210276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3867eab7ff1a44645caf816e7007eba7f273dd61e8a469f87e743141d0037824. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/TCAGM2225058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3867eab7ff1a44645caf816e7007eba7f273dd61e8a469f87e743141d0037824. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAGM2225058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887eca7586d13dc2b2888629efb02dda87dab599fa6d71ca770df86ffc1448d1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAGQ2239861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa715badd20190193b8fc1664dc998302d8ffe6b4ca9c7ff21df4014293e06411. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAGQ2240012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4e7175da4d7070d1b323fe15a916549d096926fca06da9d2e291bad1130df1. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/TCAGQ2240266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240390dd09332e18fe62ecdf8e8feaf89637c49f30d58f920bca21ca011a7eca. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAGQ2239811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b7421b803f01a777bf7f41de21b0186c342547f8cf14012ed525272afb7cc4. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FR9W12307241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb57b6dbbb7475c10b3f701240b6811a2f9f89ddbb8ea6530942bcff9d05324. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12308982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f63c46a32d85aa7b0ff4bff8981259e6e3c7925e94aeb9843240711833d59e1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR9W12308985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e474f1d3a841079c0d4f9b78fc95b40b5b7624aafc7df96eee885c455dbecf9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12308988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e7a8e1536721297dec6e43ce859f9ff122279db502a4d849668e6a97dbd512. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/FR9W12325678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266b07c2c76dead3db090bf450621652004d8c96c6213249e62667953d236dfd. 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/FR9W12324891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d10625538dd020a859f1e9f2c254d12585f05a14f954008f1c8078f29d4e2f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12324894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1193cc886f3633255a5b0581ab3f8e08d4cf427373bc9750b8633405ebbb158d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:26:46Z), 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/FR9W12324899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4084dce09a54857a3f0a105ec1c9a5c8f29a7df8547cc5e05b182ce89d62eb94. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/FR9W12408302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96aefba113ce1bc9b5ea8194f8deb7fb369db7f34dec26c9c70ff20ac693909. 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/QZK6J2487130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf188d5e668f56306fb5e6a5a3c958080851ba27b297eb5e82edea90483261156. 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/FR9W12362218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc67fcf8e9f08c164a78e7ba228dae885ed6e08b75be7703b17d195386ae36e. 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/FR9IX2301990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c88e30876630369581f12b1bc69ff542e791b79636ad67de54d5d1749ab67e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZDA72340362.