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 0xa6aac1a60da5382218d928047431ea87672b40a65c39fef498884d66fe7ec0bd. 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/39267243-9ee4-440a-a0ad-2ac03881963a.json and https://artists.proofprofile.net/proofs/artist/39267243-9ee4-440a-a0ad-2ac03881963a.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 0xc8df2299df30ab88591d6c85bb3a541e4a7844e206b9d16da3a127d822902ff0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6H2175785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561b1c375fd45e3bd8c7e66290503db178581b9400ebb0cd03ecac351f505ddc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USA2B2100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d249fa482be5de8746877e68cbb1abf8c83c963e0de4938efdf3cbe9bec4c46. 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/USA2B2100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39f0f321e02b3e7c8bada7e3d37ef56e7e2ae5e7f3d96648834a97b21ce23d0. 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/USA2B2100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71095a99d0666e9a6200ed3024b56a3343c9ca66a863cde79198704530608a87. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USA2B2100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85731b3b086e085a4abf033f1e8b57f085ccec13d1e42e4b974e374ae63cd8c. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/USA2B2100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2a964f01864ca13a811d8bebd92f7d2264090b939c21457e7244e4dbb4e6d8. 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/USA2B2100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101d32f3bf7320d403217b661c28f583a1fde37ad91466bf6312d6d4216b6c57. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/USA2B2100075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5a23681f9a7ba315c0ed41c48cf7712fdd5e0ab2fcc5624da4b0eb1f8a2ea2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA2B2201417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd192f75c31ee0848d02e6ac56f1483fdf2509f1d0f0bc92af7c3d167ff62b28e. 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/USA2B2201421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249abd4c4eaa09eea278b7f84faff7994831f9267eed597437009a6f2d1b3b72. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/USA2B2209023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8a2e69aafa0d813e17559f47c04cb12bc7b61f9d0f619f8e60faae876fce17. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USA2B2209035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9a41761aa53b66706e97deddc39a3f38a0f465a28a768907d150721cc7dc75. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/USA2B2209041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6c299a2bb2103873b19a75448ba857aaffb41c1a382aa24eca841b6f54b3ce. 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/USA2B2209048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872981cef7600e1fb0759229c86f62f47176f9616b21f11868af89da37277717. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USA2B2209065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2d27f84f2eb351783b986e9790a6c65b799acaf31075f26d2b4b670b5d40eb. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/USA2B2209086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1bb63b6e80e463da7879c1580d35a15f103c80bec1d782327260392bfb880b. 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/USA2B2209098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23d58a75fda8939d420db72fca7d017e35c16de42dabbe5e2d63a7f3ae9834c. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USA2B2209125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481d53403bef8a2c6ac773fe8d817b85acd7338bf995b9b8c1bb6461dea1ede8. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USA2B2209075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c0a809d5b9dcd0f9c6a55abe7ba8437b2176ffa595f167dfc28af72d6a98bc. 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/USA2B2318476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8df6d2ae428613a7f731eb40bb43300976b9d3ae9b00a0c80fe2df7b2985d0. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USA2B2318482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4326fbe45f645e8aef19c4f42ae44f99f8931865c46a25e47ccf6edb764435ec. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USA2B2318477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50574886ce7f3e9d88beb758a16ca9a2fe5f437ca4f0a76cca15a167f6044d6f. 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/USA2B2318479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6714de88579c07648bcc8c32aac0d320e0bbca8f4982ac18e9e5c1113cb88a6a. 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/USA2B2318484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78de0e5caac2640d4111ea61c5623b3f543c76f6673bce98bce7d8093d6bca64. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/USA2B2318485.