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 0xe83bfc23e67aad8eeb829f4f7ef418dd2d06b90a2966cfa934324ea804e25548. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/073a41a9-734a-4d8b-9891-316ce02f6a2b.json and https://artists.proofprofile.net/proofs/artist/073a41a9-734a-4d8b-9891-316ce02f6a2b.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 0xafd345943d9f0c19b0fdb5cefd6e24e9b8ff62dcc26b800303daebaccb148d67. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USA2P2250985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd345943d9f0c19b0fdb5cefd6e24e9b8ff62dcc26b800303daebaccb148d67. 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/USA2P2250985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5431185b1217747ed1e02435b234b4dec8006b157e05872a0f4ecdc2e01b289d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZAE21821001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fe4fe8d862dfc727eb55101129b2a5bc177b9578ea1854cce4d08ba5db9b4e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZAE21821002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7478c6cef5afbac664bbdddfbfa8c3f51bc69a3c8b219c22059dfbd3a041fd. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZAE22120001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6391e8937495c16e9883a152dc906abac1ca2514d8263723c89dffff6cd5510e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZAE22220001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6391e8937495c16e9883a152dc906abac1ca2514d8263723c89dffff6cd5510e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZAE22220001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe011c8ff358c805262d2422c1d44eaaba07e2433d9d1e6aa3682f8842a9c340. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USA2P2247691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe011c8ff358c805262d2422c1d44eaaba07e2433d9d1e6aa3682f8842a9c340. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/USA2P2247691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298bc2bfaec359863896671c5ae0eb51fdb273119c1ff1861581b335ac653733. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2P2313935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298bc2bfaec359863896671c5ae0eb51fdb273119c1ff1861581b335ac653733. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USA2P2313935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41da15d8f666ff310f84c010308243c7871f06c83069b772176f0d7327a262be. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USA2P2332679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c51d6231d3f86ab9a5912f53976dda65557ad5b085c6a50f4facf37dec84a44. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USA2P2331770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c51d6231d3f86ab9a5912f53976dda65557ad5b085c6a50f4facf37dec84a44. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/USA2P2331770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8121cca2b6ae0e213a30746b67f43a3c6b1e138eeb949589807aa15452c7d96. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USA2P2471398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8121cca2b6ae0e213a30746b67f43a3c6b1e138eeb949589807aa15452c7d96. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/USA2P2471398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c3b962a23107602e6bdb74db103d291e3004f2abf0505a39c5dc943135bc84. 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/QMFME2394954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce54525193dbf2abbddc89eecf6286fa13774ee210f343905ce211aa22a389dc. 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/AUXV32000007.