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 0x2e3d50dd4fe18cf1a4e8aa56f43e7fa640ada3e1ceb046a8094cab9832c1ce37. 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/8d5000cf-d398-40b0-ae7d-b48f3cf3b044.json and https://artists.proofprofile.net/proofs/artist/8d5000cf-d398-40b0-ae7d-b48f3cf3b044.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 0x1d3a8feeb0969b05779aba4b018d35c3d595c119734e116f9ac9676c513318ac. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZFZ41963755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6036d1475d4592184c7cd6175568142a6c6e12bef7ef6388a7965c570e04ed5d. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZFZ52071646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89797005dc3caa36da36587777c8ac4c9d84c6848896152549dc9211e5e13a3c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USUM72104105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e46940bb256d1bee424c3bdb87eb66773b62c4223cc01cfce9dc68424cffc16. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USUM72116428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d0021b83edbf292417960c1632040942091d147bd486f1f48e78fa6432e646. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZHN32269056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2c12d40eaecf94f8230707f2f58d4186f20e08e13819c5fbbefede915ff5da. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6M2233551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984d8a9fea7058cb11ec5ed323b71fdc8065cbe45c6f5f9434241f8e472f14ae. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZNWT2224241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa77c49ec0105a5795c30759b9f63582f2236d3db68fa030187650eae60243b1. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHN82306377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea930ff038e65db5f05b773080d2a519ec928d4fc726b3db8715fe134add94eb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZDA82418019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb821085504e972999915a54ef9d3573be250d61db703ba49e0febc779c9fa0d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES92429047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166e7a33c46a9f8bb1af5639b1f10f3bca78da6b17640e6794fda682b5c62466. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZMER2410827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc383ac8494bcc709de4acec60c7b815fe508051f29340d6f76b74dc876afa52f. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTBC2453031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14611693ab55961ed4a4185a4881643a4db12536b0b535c53abaadfa36248277. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN82565474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766d64917942b14c38ffeafc4c8e1c646638812406d380d1d753d3fc347f09b4. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZK6L2580351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a23745fadc95d53488c704f3cd79c70bdbcb5c2543b8406a40b7058e5578d4f. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZK6F2549042.