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 0xba08d5400a98b34bc8e17c2108a5049bd86fe48abc881ad59f4bf676263eb5b9. 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/eaa2a71c-9fd5-4731-90c4-5b471efe2177.json and https://artists.proofprofile.net/proofs/artist/eaa2a71c-9fd5-4731-90c4-5b471efe2177.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 0xf66207bd7280bfc9390dc9c731e55e63f652ebb4414c25bb3b092c7402808ba1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEPI82319430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe566c9f78d99e79ca6b286274a3eec54572ad1cd9426538bbb3873e6dbcb4737. 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/SE6XY2384456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d461f81aaeb48f7fef4f61f5f4dd1084892f1002a4c2a43c43acd8d417a448. 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/SE6SA2365167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690a9f1509ebef1abbb21631007f6ba25254d42c86b2160911b254ac0fa89405. 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/DEPI82415318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1b5fc5ad5b87cb43f728d0206feb688a4514586100211ac22c66499ed37f1e. 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/NL9KQ2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881df1d267b736856d0362a767411466ea8ea271d3bad794080fe6016a78f98b. 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/DEPI82432900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa337e36ba445e34872b1e74d6fd076225b79ed43e0c6a6e7485345b67070172a. 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/SE5BU2488151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3f96459a6601388172a02bc927097d4777e01dd8ecda11e9e22f15f2b14fae. 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/GBKQU2457443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849b8df10bdc84de55e9eb174c57f62fd5211e30cd1821e01136e7d8ea9d7176. 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/GX8LE2467498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fc392e360075dc0f113496490233cd8569ee87e5d3e9bca00ae820885aa33a. 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/GX8LE2402232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed15020e726cfb9f5596c7cf4d361dc1e0c6f9ce0fa534487808b1094c6a7bf5. 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/SE5BU2479472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1db100d05214026da5e19201c69cd9d5e7775b30cb30c8ec1cb01b84fe8bdb7. 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/SE6I32479780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa344bd3fcad72c444ac6717a03da4c09a11ea077cdfcdebb333f1cd17e8ef355. 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/SE6XY2322405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23b70cf0f0eded8a85f388494b10f65eabe43e2c024835f43054acbe8fd18ec. 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/NL9KQ2390093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee96b087aa810b2aa56873172325194310f0c5e8464618f20bae2a505126bab. 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/SE6TI2371209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf209c8b1a3614e711636babf74f08b2ed7c2d6c46febf9549ff7af63f30a293b. 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/US38Y2305478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e865ddcfd381a44a544308ef4798ea10880b4fd79b422f072ec4c0ccf9a969a. 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/NLT2H2300895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7869bfb1f6cd714e0985fc0ba8c0e100d4f2f5fb7d7bc6e891646bb0084a6fc. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GX8LD2323165.