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 0xe6cb6d181f2481e5ce5426d38790ff1d2bf982538ec1c9c08bf465ee264682e9. 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/c2e98c57-b4ca-40aa-8c5d-b6f147073db2.json and https://artists.proofprofile.net/proofs/artist/c2e98c57-b4ca-40aa-8c5d-b6f147073db2.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 0xc6015f77bf32fb2c9dc194b7457585df9f661f70316e40e047d6cf07f5075fe7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRZ421600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e0a42d1b598d1127786e2af5581c2ea43a55bdff9559b7bb7c7db5b13c0b59. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/FRZ421600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca70d989b68443fb094800a015c526f232e21ed08f511eb1043c5ac8badc822. 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/FRZ421600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313b6e33d66a14bd42c3393fa1d0a5d6a5e03914fae0614dd812e674f4be62cf. 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/FRZ421600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea25ec88f4087bdc79cf8af11c391d92fd7610773a8d6cc1377108cf41e4fc3. 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/FRZ421600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514da53990d3a6b9471a3170df0b603b297bbc647363903897d8e99618633f27. 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/FRU781615000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6015f77bf32fb2c9dc194b7457585df9f661f70316e40e047d6cf07f5075fe7. 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/FRZ421600025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847add614ff2dc136d12ae6e9f7e8278b4a7b4ba74e97e6ed7643acf4a1b2abe. 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/FRZ421600030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca70d989b68443fb094800a015c526f232e21ed08f511eb1043c5ac8badc822. 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/FRZ421600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a7ebf718a62ea64e66e3c595197fe91bb29a11e867ff5483ff44fbeae739b0. 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/FRZ421600035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41db7ea4fb1eb6c1f86ca2d07372268e36505c7d3900e36e2ef094565ee7b2d5. 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/FRZ421600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32423b7a352ae3897751febc724cc8ebb5d43b29ae4540b800e641170fbd277f. 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/FRZ421600045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fbe096822dbed3ca1c81a50f2785b9d7c3af2bb0f695cb8378f0bc6600db29. 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/FRZ421600050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b4bff0aaf33691cbbb37b9b49935c5e8ce8e4d35459c2c0c6edcc48cd7c646. 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/FRZ421600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadaedb65f2251e50a955f0eddad00789d5eba1938ffe03e8766b2eef53ee0c8. 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/FRZ421600055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee3c9764c132790415e79a40e92b05874d70f564d6f9fc2e47221d405b8ce98. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FRZ421600060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e0a42d1b598d1127786e2af5581c2ea43a55bdff9559b7bb7c7db5b13c0b59. 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/FRZ421600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e5b491f6dff11177d391854e25e11699695784e11a6096e3b9628348f5d79d. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/FRZ421600070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b49a63e7b4a5c574b617262bf380f516d2adcf6cdddf04ee427f3a5665cc429. 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/FRZ421600075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46c5aa0940cc2f6d0ac2cb96964e4e4b6bc08049a0300fa224c8aa0d09531e2. 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/FR9W12125333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8181bffa6f49b40ee8e87a8cb986d2307764d500901b38ec3714fee042b1680d. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/FR9W12139268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1351671d169bd7e5e8ed1b3e2d9eb10decda040c8fae52398c669e18b164490. 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/FR9W12139271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1351671d169bd7e5e8ed1b3e2d9eb10decda040c8fae52398c669e18b164490. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR9W12139271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1796897720418d5c102005a721d2d7e5fb60a4ec871ebfb423185fffaab2b090. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR9W12007551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46c5aa0940cc2f6d0ac2cb96964e4e4b6bc08049a0300fa224c8aa0d09531e2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR9W12125333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8181bffa6f49b40ee8e87a8cb986d2307764d500901b38ec3714fee042b1680d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/FR9W12139268.