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 0x0ce9a19e97681707e172aa1f5b81a1f4c2d650a3241d228a98647262be34a809. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5760f05f-48c8-4063-900d-297145a71e6a.json and https://artists.proofprofile.net/proofs/artist/5760f05f-48c8-4063-900d-297145a71e6a.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 0x6674e9353cb5a7c650c9142462666b7a287e1bc6e1ff843a9b77dd1ada4c5316. 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/FRX282459368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78cc76818a5ef9d6b313917c082ffb996b46e975dc343b4a59cc7705793b615. 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/CA5KR2436247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846280f2c3ffa1c99ebe68971cb2d7e850fe90341ac2dc026af11d04bd7e091a. 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/CA5KR2436248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcdcab38c6cd028a1ce0bab8b17b261fadff7e76d4014abff47cd1fc2ed9772. 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/CA5KR2436249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74d05d8de30e4dcaccc0a6d340c40101b4491675107ee4f4c939958039f75c7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR2436250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846280f2c3ffa1c99ebe68971cb2d7e850fe90341ac2dc026af11d04bd7e091a. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/CA5KR2436248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7d3eef9d9da517fd2e7aea2e6d6f61fdaf2e9fb03fb4e957c02858518ddab5. 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/GB8KE2317094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b8ef6292b8cc3f53d8dc1d10b91519df99db6e44ba050a9ae234c351b29e68. 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/CA5KR2334192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a5471e5eb349be827e0f7d67fbab9885ea7cc45143477d8382b6eb43e476ef. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CA5KR2334193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaefdf68640e62dbff3f9e8efb52e6cf40498226e09b75be536da334b6a5281d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CA5KR2334194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e6533f8fed09b6f5421a6c34c8ec1544ca1fc69bb6f5fe63a284f6b5ff944c. 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/CA5KR2334195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740c38ea262c359fd11f6a7f312233b1779e7ec28e19934cf61815b1bc08ad1f. 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/CA5KR2333985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60eaf56419d63724c35daf4ecc8daae76e5ff97ca16cc18e4d4e16852902d8a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZKDK2231543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b9eea655fa7fabefdfdc0e035611c3a97acfaa7eff634a86a833736fd34b1e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GB7YL2000168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325b164f96b3b53522a0f51cf40444c725d57899027d9513d5c376e75e13829c. 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/QM42K2021128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f34ca0eccfbaac155d2dc02a08fb1a037d03d529cb747f6e29f285cfca45bb. 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/QM42K2009624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee610ae71c4a2c915cd25527892f3d2db9b1bc6ff27be2d39b00f1a64e439f0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA6D22400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30fbc87ce7fec04f2958ee3b6961cb5b39cda6897f5fa285dc86524399087d6. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZMHK2276558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6595b1e68c80f2a2d2afebdc9fa119aec5a0a57e9b1073b06fb60d6d89750cbb. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CA5KR2183091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a1f501b58df30ded597558a07002e23237424426fa68553eeddb59c72519bf. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GB8KE2162378.