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 0xa28e276275804ccdcb3770caeeb2a2c23f0436c20553caa37d3d76b2627df51c. 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/5336632d-4a74-4832-aa05-f2205fc8e7ec.json and https://artists.proofprofile.net/proofs/artist/5336632d-4a74-4832-aa05-f2205fc8e7ec.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 0x892fa3cf8fd75dbc8e2b2a55fa28414773f9fcd0a016ab0cc26d7217a1bcf89d. 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/UYL842200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b51cb621adf9b41372b946e352f5f377550c35cbcba9fa245aaf58570655d7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SE6SA2066492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137b779b326f0a3ccbc11d7322d78c846b86d462f809c3f01fd597a7df4c78d5. 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/ARIXB2302058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403ee4df79d8a199d1bf97c9fe02ef2147e01f8f2351d5b5607967470be3786b. 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/ARDJG2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c59c385bdc400bf522927e383aceae5448df3bba95735d5e3386c1f3d86128. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/ARIXB2305602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3500b2bdc100294743ee99a0698861c2792460e63327120caa7b3c0a27f2965e. 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/ARQIH2291419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf073ed24defdb541ec44cc9b5ef74549e1996e63f87c77f7c344687b1951060. 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/QZXYG2400537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8f3c4c462da24527dbc6c63c1fced6fab50702c634ff7a6a06e9057f98e438. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE6TI2164766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4fdcd35b879c10e08434bd3049ea94d9f04b159e3ac191e63a97ff1a5e4a6d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ESA012104372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734c71ff9a2ca2f7d559fb5c5d78d5944f33c4205c46bdfc61ccfdcd14a00afe. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/SE5752059068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc682056dcaf3030f42aaf3e798d00a600a393fb4d7e268f29771500de9c26025. 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/ARG991044898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6956ff0ec6fb2f201a223aabc1a0f249c81cdb43348632918439f7a6ff83f6. 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/ES71G2100210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf368b85777acea4cb59131ef2b189178d1177e527dcd8e37841fefe362ad2966. 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/QMFMF2103107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ed80084c2129e041cb120c5c6c0024fbee2f9cf0e652d0bb73f843b0dca75e. 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/ARIXB2300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9f8ab1c6bb5e7b1576e7a51ff4ac4da0d0d489beaf53fd81f10074cce8b1fa. 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/ARF112400131.