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 0xaf4cfae92aff7c32f9c317fd48b5b153ec8a74618c472a47e0537cd141a3291c. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4e3fefa-30f5-4108-a2ca-79181179ca07.json and https://artists.proofprofile.net/proofs/artist/c4e3fefa-30f5-4108-a2ca-79181179ca07.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 0xfc7e08b0eff924d04ee4ce5da7d070176335734cb29e48ec5a7fd9bd4b7fddd4. 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/USY870700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74667749340f58ce995af624cb29152eb74456e1801f84bb387288a5060df528. 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/USY870700118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990009ff62a9b4c85d1d9012895bd1d79c7d8dd5b0b2f17ee8d921b37766bbb1. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USY870700119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a83709092f773a7dd721287e15c316ddfd572e8fe8dccd57bc4a25039edd99d. 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/USY870700120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdd17dd45cb1f927f0aff16ab63b65a460e871d3b3e232f79961fcaad8c5517. 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/USY870700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547e45063d28382066d22580cfc5764dce61656e6c6a8fbbde8b21db7efe0fec. 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/USY870700122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd965bd7be66fb1654f4aaf512e3c647d1e2f7e2472cc69a5538b08f65deed47a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USY870700123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fcd4d7c8647e7f6a8befd95629738aec40705d2ac162a437a83431060d4394. 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/USY870700124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4cb855dfdf2fee672405134055b385c81e20f739c0f9d25d8556c01bb5adfe. 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/USY870700126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c3533ab52cd0f89de9f2ccbbaa6940ba90399c57fcd40e3dd4f4746b004d03. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USY870700127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138dc53b147a482dfea04330e3fbc097fe7db5f4044898ecbd2281eab11e6e50. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USY871100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80791f7550343d573bb3717cc43dad77748f6990379b009da22bad1303109d18. 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/USY871100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b7873cd8ddd1af0d531bb0f2226b214de745bbaf9d8dde047e5dcd888520a1. 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/USY871100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df03c1f7d33e7689b60450ae455cd744301a5d4d89db134d0f344e8b4975fc3. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USY871100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae48d758fdf8e2ec907998ae7d34d630b62352f32fafb89e772292829646571b. 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/USY871100025.