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 0x2e222055b7e449aedf45301b30572bcdf415ef09b166d8bc54777e63b1173722. 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/fe911832-e9f7-4882-aefb-f041e3586efb.json and https://artists.proofprofile.net/proofs/artist/fe911832-e9f7-4882-aefb-f041e3586efb.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 0xf9b6c978827ccafe5f4ac6b3fc3a65f397adee1e4d456dd9d6228573ce511611. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BX4XS1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e177834e907a6ff33f6e89387fbd01f38fe7f763d98233c951648c3672b4e6. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/BX4XS2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf30987067926cd68ce4678171cbd86018ae801efc21a8f99b2af8687f84e188. 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/BX4XS2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9809f9118e9a71a568e8355a8e3520099ab9898fc7b901adda6b17e896d5b7df. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/BX4XS2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a0f5e90ec996cf69dc4d1835920c9720d40d255dfa7ec53dbd9927393c8e6c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/BX4XS2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab40dd6ffb844762b2cef8a88758c7072537098ff4bd403eae54a64dfa4999a8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BX4XS2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace023827128f1a1f144c39894e6d7ce8ddeef4b10a58c297d134f7bcb6142b4. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/BX4XS2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7176b422d591ae92a1f4b0dad091365a5a20eaf7f43871b875043ca5ec8d759. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BX4XS2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c501e51522964eec3bf9b061858ea6acf3b537f5e70c09f8fa61cc1c4df72. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/BX4XS2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab15e4443b7f8cfb04f8b00b0d1e3624acbc99704185dbad786f3c5b4c61a8c5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/BX4XS2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8245d151d7d346bf6640e549b074d773791648b34785994181c0011c2ca10ead. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BX4XS1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358d8dd2f48c6117c5feb893ade78a03c9be8c626c9fc295f0d8258f8de210b4. 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/BX4XS1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf86d35ef68e5cc52ca646f85de65e2ca6070a4496071498e5cb82989eab0b8e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/BX4XS1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bd2f27e9a126193f99af8d31f5fd4738b3e9852457770a78d553234d7ac7e9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BX4XS2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab40dd6ffb844762b2cef8a88758c7072537098ff4bd403eae54a64dfa4999a8. 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/BX4XS2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58822856f82c2ee22d030aee297bcadab9cb1de857a572b051e72594e2423f07. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/BKBVP2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2f530782c6731c85087e34427ad6b934f905a58b759f1aee947db0ca92cf72. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BKBVP2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf49f10431300087ebbb8537aed17063489407be84394280e0bbf474bf0f5ef7. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/BX4XS2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943de76e86d8a124715c53227e1b19ee673b349ce9fc95e23b6479d6bf444394. 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/BRCA61700005.