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 0xc256792adb2537a02d63c66ed3f56352496c9a4671531fc20e1d2d547fe62038. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/330afb46-1f15-4ce2-a29f-6a60cf55caaa.json and https://artists.proofprofile.net/proofs/artist/330afb46-1f15-4ce2-a29f-6a60cf55caaa.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 0xdc251cc33fa19c4a71e0af161787e6f4248d613f570717232e2ce407011ca357. 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/BRFXO1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4406125bfeb42939375196e1f258ed48ff0cc6b64214796052bee27ce0cb7f53. 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/BRFXO1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33c7268fbfed2bb54f57543b5aad715a94c146edfbf59774bf259bce881583d. 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/BRFXO1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee36a277a4864343ec105254a4395a46096ea08dfc4c95bc7eaf3393bc84cc1. 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/BRFXO1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa915026a78c5240679f5e5c6139bf5f869fec763eb70bdcdb2a0cd4e17cd0158. 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/BRFXO1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243f5b6cfc5a66ff46746ff4d4b718e11b656f925980ca710f771580c9c61f44. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BRFXO1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd79c97779e7ac5be1a0cd34daa2f66049ada4db5bfe59c3355127488cca6e7. 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/BRFXO1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135c7e3441e7626ada73c7369a1ff2bba99f445f10888f9774c716248295ee94. 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/BRFXO1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14382268f3df866a8601186788f6cbe24f83719c1a31d487229d62afacf45110. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BRFXO1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5e5c0fbb36da84dcf86d0b9a17116922dd6cbc30d39177c41ccf37d0d7788e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BRFXO1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52f0240ef051eca510829dbd2ff5029ab795174b9ccea3fbbfcbf7619e3a47e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXJ5S2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57293bab7facdcd7fc309e955079700b6897f6d9c15ec3bfe068bf7d17930f49. 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/BXJ5S2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483ad49d9f627d0045c1d4723eecbcc60c1d408d216168336a8d30983697eba2. 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/BXJ5S2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3800a9d44c6080d0484f56e1c7c781f1a5b255c70948cc3d86b2c809d5deeb. 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/BRGCU2200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243f5b6cfc5a66ff46746ff4d4b718e11b656f925980ca710f771580c9c61f44. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/BRFXO1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca383c9e1aba920d2d092c08cff2811d7793adbc52c82e11b5a4ab12ed95852d. 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/BRFXO1700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a970a43f92f9acaf2582a91c865bb793daafc2f051b24b1215cb9f975df503. 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/BRFXO1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515e0af927ad8ef09ab4b636d6dfb2e7e0475761a341bd9b4f056d3d9bbe0177. 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/BRFXO1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88652c6179cd0f0b8aca8caad29a654eebf7326598406422c3d2b2067460ceb0. 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/BRFXO1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfba38b6c85c67ae6ca3a082fb5fc3314a0818b3220c5ea9de979fe380297b4. 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/BRFXO1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894b7aabab361da2c21cbb2470c99350b8524b005a1f5edb4298e0757017cdb2. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BRFXO1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd977af35b21deda4beb445294988a7e08f7e6bf6dc995852bbb939299c0b202. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BRFXO1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d7b77c85805c807921dbe6553f1d0c768e8a3aa30353e326cb7da80c44e866. 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/BRFXO1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fd91fbdcdc4150589a7d00e08c652da986672558aa46826e53c00527016c7a. 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/BRFXO1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf891ece06811072769c1b238ca340a68dc373fcda60b90578353c358c5411a. 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/BRFXO1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f1926b42c5c663474230dfe04b8c6be97f641c68b50d08328fc01a5ca515ba. 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/BRFXO1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b2db1b73e96915959343700c3512c263fde508a6d7c59ea1102e338c50ef64. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BRFXO1500001.