thumb|right|Heavyweight boxers Andrew Golota (on the left) vs. Kevin McBride at Madison Square Garden Heavyweight is a weight class in combat sports and professional wrestling. Boxing Professional M
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 0x8430559cb664f92c0a4018f5e90f78bea3328b3364e0955771e2e8dfe31ae0ca. 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/89625c60-5060-449b-87fd-ce32283db4d1.json and https://artists.proofprofile.net/proofs/artist/89625c60-5060-449b-87fd-ce32283db4d1.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 0xa21ed2efde903a067a9e531866f4d330ae14c4adf34fadec24c9c7ed1184374b. 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/PLC062010340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80385fca22f6be742a44d319ea00fb6a560799ce9ee0277371594110c3c6e729. 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/PLC062011013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015123eedbefa2cc7d805c50e4ab22b8ecb9cf8a7d03229832941b077ef4534d. 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/PLC062010470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc5a1c57d6f43e3cb0b4f9052d844ea7f4581d9f369e302624a8960a6916962. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLC062010620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb99b09a188a23fa4a8a0d395de419904924f62c8db7d7e5db52e81f36e2a0e2. 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/PLC062011703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80385fca22f6be742a44d319ea00fb6a560799ce9ee0277371594110c3c6e729. 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/PLC062011013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b7898950ecbde514f8e425d4e4604cc18cba564a0fba6c56c49dda7dd1ae72. 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/PLC062011704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21ed2efde903a067a9e531866f4d330ae14c4adf34fadec24c9c7ed1184374b. 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/PLC062010340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb42bdc9302027765ddfa531c096367294d587738f6cd8ad7447009f30cfc25. 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/PLC062011705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ec807bdcf62770d45a08169b27c818a11e5d2f216a4fd22a164056fb5c1915. 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/PLC062011706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf24efe4f8ca7cc48456a0f70922e3830cddd701e348d45343203a945f84ab21. 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/PLC062011707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e41e911b47604b54d9e392a551f5781496939ea75f0da258093da35b401f18. 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/PLC062011708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf24efe4f8ca7cc48456a0f70922e3830cddd701e348d45343203a945f84ab21. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLC062011707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b7898950ecbde514f8e425d4e4604cc18cba564a0fba6c56c49dda7dd1ae72. 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/PLC062011704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb42bdc9302027765ddfa531c096367294d587738f6cd8ad7447009f30cfc25. 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/PLC062011705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa60e7ddf5fc061a083ebed18088bb280faba943b11bb56aa75f6243162499e. 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/PLC062116210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb99b09a188a23fa4a8a0d395de419904924f62c8db7d7e5db52e81f36e2a0e2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLC062011703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d35dcdbd7f236ad4aed692d57e3b43b27a80a311e5556877941984a6605824b. 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/PLC062120124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1756d9f8b3c05f7bfdfbb0205d0071757981e07ab1eeeb112bd518e39e719ef. 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/PLC062223335.