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 0x91e3061e30c300e5270c6c2f97a5984059a8daaaa78c3d842ca603beddff35d6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a8062a3-ffe6-44ad-b810-19edd5a2ce66.json and https://artists.proofprofile.net/proofs/artist/6a8062a3-ffe6-44ad-b810-19edd5a2ce66.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 0x55cdcc2503dabbd4e3fdd0f08265c2a600abd2c14c5a0eaf158b018a9d36229f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/HKC992425853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50922769bb4e6553eb143abb8aa032b07f7c3be4e183265487d9babfb3f0f1de. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FRX762491364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171a315f4bb01c0642792305d9b5ec7f05a4581860e802ff3f263da123d8910e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKC992325157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6ac392203788c0feb89a9ad5cad1820d7259687818235bc770f33d4ac42caa. 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/FRX452323238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73de91950f01e41f931ca38a7320764ae114b6b67d47ca37182ae198c6207543. 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/HKG732321533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bfa263156f68fd0529a48d61b20db180cbf1077955fddd731c0485aa573030. 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/HKG732321545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c84dcd99ba7219909eebd816600f7296af19558f103d27abd22713b4cb67b6. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/HKG732321546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a39c9597ca36420b5aae790969afdf1c95cca35beb773297fe53ca7bca8a28a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKG732305447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24aebc410ba9aa0c09ede56f69d6bfba65953a4ab16843b463c6e8aaae5f734. 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/HKG732289670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044fdbff8e0c8e05bd20b76445ed42deb98df308cda37c1397b21f40dbe19aa9. 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/HKG732284008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63210b6791d916eb911243f298e74a3999f6c74fddafb8576ef9f602e3f8ddc6. 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/HKG732262752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddcc8298dc207ce821e1946d97823f6b49085c9b9d3dffecf615e4fab64800b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKG732242146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c046c82eef0f962e32a67b4856674b1bc4782e0ec1ef80731603f77e6d78a34. 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/HKG732229867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79486d53fc6044dbfae6fca4899538f48e32344816359641416e399656c79af. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKG731776085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e760a80aca67823fd9cb32dec18316a577cf612a011a1a1248a52723f20d32. 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/HKC371642794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f819c20eb19adb5926c66c3c45ca1b208dc046eb414729728a74058a5a5fd2. 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/HKC371642795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b02601ed543056f759c2470d5c4ea9ebc77fd05b43718404e341b5a0860591a. 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/HKG732128251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa60d2eadb025db78592cb5acc65f75eca9fad1009af96f9b08e7c85c2e2ac13. 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/HKG732128149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772a8831d4d05daa879a474e11d65df9e49e6b52ce709441dc3491388d3c7614. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/HKG732152914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc6e7f307d9f766523b034171ced6c252ae67cb0595204a31fb86a6439e18f4. 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/HKG732140775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ff0f9195897837346a1efceb38c1fbb58b88d7f0632af4cf2d880ed77ac9e8. 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/HKG732125040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf88b962de6b4814ae6a07c69a0229207b4c47791267560198dd877034c89ff. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKG732104520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd908de627fed1ee8bc53c018e4eedd602cf4a9252b54191855d9570baccaab3. 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/HKG732102539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c4954dc141877e5b7e3cfd8882e30cb87441989cfa7d259c0d3587e39e3681. 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/HKG732120149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859b2f1eab08ef53ff817284a2f13af559a9ce503a365e5cc1cc5aba9ee2b4f5. 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/HKG732027430.