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 0x0592655c9a12f44de1de3917b6b0c7f85bff0b36a192bf7bae4491f309707f89. 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/9f8a09d7-54d0-45bb-a6df-ef20b62a4400.json and https://artists.proofprofile.net/proofs/artist/9f8a09d7-54d0-45bb-a6df-ef20b62a4400.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 0x551d5ec1de1960aa0bdfcdcd9dd3795415ceb66053ce15d16895786d1198ef39. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLSB72200782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457ddd7f0592fde663ee7d5328fcca0059e0925a9dd7d5cf123294e0053db5ec. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLP762000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551d5ec1de1960aa0bdfcdcd9dd3795415ceb66053ce15d16895786d1198ef39. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLSB72200782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536c23feaf7c7e38ed456889616b6cc0a2b8ee9f8e5e2e214b4b9e8728fc845f. 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/NLJ5D2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8666c3f30ff1c588bc7ddfde37c682893e32bf090d9e63993e24a0609bc4a2. 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/NLSB72100383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2524b84d6e5f95692a293d0c82a412cd5eeda2f9495cb4a458b3dcd2f5c473. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLP762100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a95ef6a57f45348ccbcdb3dc436ee4ae1f1017a83facc4780fe6747425ed4c4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLP762100259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604d67e1f831efb26734b9cb07050a051c66ddd3816fccd4e65c7e4b51d8f61e. 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/NLP762000189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982b52a0e62cfcf98b223960ce95911278dff0bb86e6fd0ac27608aa1119c5f2. 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/NLP762000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909fd56ece3a6366bcd25e62f73e1fc7c60fd25625dab535abe1b7e5bf6517e7. 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/NLD322200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909fd56ece3a6366bcd25e62f73e1fc7c60fd25625dab535abe1b7e5bf6517e7. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NLD322200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e73a4d7e3bd0b899675ce2c2b7cfa20ef4a477e0e88790240df6762bf1ef39. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLG662300143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34185f5c3c5ebe6afe282620a48cfa6c0c7428df6d88ca7bfb67ad1a48352305. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLYC62000175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93296b0ce68d2c5abff2ee447970171525e0f709fe27e08a25bfe3b11a97cdef. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLA6M1400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf51c8ff9830c2b0f407fc5a8b5a7323776d1e15bf2016beeda1403be15a96c4. 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/NLA6M1400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c4e984c6650076ec20ac4c52b9f36fe7f6f9a0dbc6860c172a14a2901e4a50. 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/NL5B62400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95c56d68f0c7d37cd698a72a246d5588b44c4f6376812df2984cc420e1ee52d. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/NLG662100147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181ec258adcaa3cbf0cdc99c4382eb8c4293414fd5c3928d8334edab4eff133b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLQ5V1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c4e984c6650076ec20ac4c52b9f36fe7f6f9a0dbc6860c172a14a2901e4a50. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/NL5B62400011.