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 0x5d7f1374621c55cba024d9aeff54538a2f5bf344a866c1decf81f72de52c8a88. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05710130-b43d-4684-adb9-6a8a8002edce.json and https://artists.proofprofile.net/proofs/artist/05710130-b43d-4684-adb9-6a8a8002edce.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 0x44037734504fd51f32f02728445a3e2186546c90f410497bc759cd82a003132a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/FR6DC1300190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d59b450a7066fc5dec879c0dc6ccbbb2615ec7a363e11ee89b03335ffb8f4d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR6DC1300230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2aa0be16ce1e97cf15ece7daa114f05808149a2306bcfdb1de425aece0e43b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR6DC1300220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7346f4adfa681953fffb9a3a3d5573c6023450a21cc6a9f13fd36e4589e94a. 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/FR6DC1300240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb52cab7bb047eb24c40c5f7beb147bf68770208c7cbb05ee26be757a29c19fa. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/UK9AV2200332.
Maples, Ash, and Oaks: Cedars Instrumentals
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93b545f12fd19a4d685925cf152195c0bbb1fe65dfaf9f5604a23c7d3dff83b. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USY6C2135201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fef67072cddf86c852fa1715bb17d168474355a1ef0953abc75b60edfe5605. 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/USY6C2135202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3391abf06de595980767083a9c88ba8f208a06b24118bc6e8e8ca1981c48a507. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USY6C2135203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c49e189a0ce7ee3189511a6cabfc2800387f24e6553b97fd711312a330cb171. 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/USY6C2135204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbde45def03987e983f8385a4c3e5e7a44ba96e35987240a4763ab5330b2e8b. 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/USY6C2135205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402863c34bfee131823d9bd18e17d05d88c38aea8d0997ed3ef043fd0bf091f1. 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/USY6C2135206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8a46e17eef945d46ae966f324218caf1fbd4fc8887279cf5d9dacfdbc01958. 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/USY6C2135207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f0eb2269e54ca26c2c87ebc0a7194be001d4248c7c843b0100e1808d29ecd6. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/USY6C2135208.