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 0x76b33fbedc5223de9e46a04508d43c7ecde8164a1a3033975acdad7a703a4434. 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/fa3ed948-c7be-4043-ad9e-5524bce495eb.json and https://artists.proofprofile.net/proofs/artist/fa3ed948-c7be-4043-ad9e-5524bce495eb.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 0x50f8714d74176d3089beaee54a7ea672d554c42e77ae5fa4fda1798fc021de62. Chain 2 (Bitcoin): anchored in block 957561 (2026-07-11T11:41:29Z), 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/PLY041700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2bd1ec279f8c7a255c1ec85e282d12a62b8cf0c04088dd9eefeb0104bfdad9. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/PLY041700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2ad801c055e0a6490060b9eb1df3907d68864931dfda00bded1184c05ce34a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PLY041700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4fcfa0ddd3f69710a393188b1ee280f208d5b215913b5cb354b8c7f9595b98. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/PLY041700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a779fd2b3c69c98cd7bdd5580ff26c5497203c7806d05b93a4436190b44017b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZES81890204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e6210022ef8ada26280a102c229963d7f7c7562a60133036246e4a0b79c201. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZES81890205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9298691d5c180b81988abdd6b978219572a8d57c980e8738a9cfae5faa549677. 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/PLC062409212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635f5c73c193ce988ca3ab294520cff62599e99c8ea8381c184a4a9baf2ea804. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/PLC062415233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf27b187e001f4ef4c6bf123bbd5b639369eb4750263dfea26d152f885318c0a. 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/PLC062416377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0771771a87b6dcd62997e450d0e3c6705ed4e8d2803f10c3e7d71ffd3522c4. 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/PLC062411981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03974c084a08e3141bcedb35d8365ae9702009ac4949689d7ccf7dc14791d454. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/PLC062416378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885144f5dcdab574123a0776fef31b47b4f323cbdbf722e3ff832cee6eee1385. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/PLC062416379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bbf4e2a000531d802ede25c7b0178ed1ee344dd2390a337731c8f359db26f0. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/PLC062416380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07136cf4b16d93235f3754ed0537271e5ea4780aaa9403816d3c3c15d08bc56. 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/PLC062416381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d8cdd35f197e947de430461f920738b556036db58279d53ac386940ad55acd. 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/PL37A1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a429179ba06a2ea516875709fbc56bb6c44fb9f390defb3f594c15576049b5. 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/PL37A1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c32196e2b6b704ec5085202e58e445974bcfe3f44cb0a6479fe4629b7f5d8d7. 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/PLH871300066.