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 0x88e6be308c4baf4e8e553274b573f16255cfc40fc75652fa390e5cb558f34ece. 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/18e7de99-b8e3-4e8f-a638-c9453623d191.json and https://artists.proofprofile.net/proofs/artist/18e7de99-b8e3-4e8f-a638-c9453623d191.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 0xf5a0f723a99c371cfc5dcc96f5c419c16c7be67d235649384a1a81cafc8a547a. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZNWS2403063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60a793a361741b6d8c376d1e82b3cb57b32da338f4736d245f826d8bc9adebe. 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/QZNWS2403064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbaffc010ea207d62bacf4d4e2a739f97ae4c972a1c5f0cd8d884f3f9589a56. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZHNC2445095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6c5efebb7a31f96464a9ff051b25b5b581dfffefb3201018d87d39e5bcaaa8. 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/QZNWS2403065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e825a145ae5885296480e34d86e02db69fd31c7afd02c04b157bd6df0bbbc36. 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/QZDA82452602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98115e624790180ba667522730fa8bd842117ad2621c24ea5804c2873df7541c. 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/QZDA82452603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a9bbdb80b66380a42298e541888ba8e8d0ef99136dccb1ac6e83e62eb93446. 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/QZWFK2303687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01673e6452041d7361247b333eea91db4ad60d23b84e0dcb1e8e99fc2b61643a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZNWS2403066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264ee10fb00bf5c0ad2b9c891e25cc111eff56a073067450efa3664c1a2c4607. 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/QZNWS2403067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3a25502d9bcc08bdf30820b7e3c248b08baf73b36457b0db4bc3381f681be3. 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/QZNWS2403068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6f453de668a2978485705631430f2f45ad1717d9c095eed7f022eb0e4f3c5f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHNC2305372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b836aa3004f4ba5a59f7e9522a661f44cf88cabca0e2ea77720196f19a0213. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZNWS2403069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1796a2f0cef95edf15f3ca1fd4288db3a03aa4a2d23bc3277481d2d96670126. 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/QZNWS2403070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2face4d7f780ad6e14225506bbefb7b2c34352e3f2689a5bad9a33066e340565. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFYZ2361907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce56cc732d278fb5062e97c52dbb2fa6220e4e2f906ac6d171ebc2e3a5dbb676. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZFYZ2361908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5785035ea01fdbc3cbe530beebaae17379702759210396a2639b31a96fa56dcc. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNWV2227327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a171fa160b0b35b5cf1a47e69ab505dfb555acc62450b5709e897b6c2da631c. 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/QZNWV2227329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8163dcc08a999f31335d3b20bfc9eca9693403970728989f42fa1e957d70ae. 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/QZK6N2266704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509f31ae03ba6b966346671a7988064e20f14e69544675b713667e70270899c6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZK6N2266705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6891b24885638899f277d9506757aa2f3d0308caa9331f2be5c834c66858a595. 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/QZK6N2266707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb678fbc673b39dbd2f7bacf7af39265a6584bdaa6cfeb5e7fa1bd7ee47bab42d. 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/QZK6N2266709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbaffc010ea207d62bacf4d4e2a739f97ae4c972a1c5f0cd8d884f3f9589a56. 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/QZHNC2445095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e825a145ae5885296480e34d86e02db69fd31c7afd02c04b157bd6df0bbbc36. 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/QZDA82452602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98115e624790180ba667522730fa8bd842117ad2621c24ea5804c2873df7541c. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZDA82452603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6f453de668a2978485705631430f2f45ad1717d9c095eed7f022eb0e4f3c5f. 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/QZHNC2305372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d4afa6fa8df6f5efc3f26f79290b07c7043f769c169d30e8926655107c1f66. 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/QZTB52201691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c1aee4fe7ad1b6351c34489915847bad3fc1c2187d327290cfcf257f0256ac. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZTB52201692.