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 0xf834395844ad8f79c9b964d2b4f09b363423f507ee74cb21c31ff06ac2ee5ead. 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/d2f37dfa-8c51-43e0-bdf0-cdad3c55687c.json and https://artists.proofprofile.net/proofs/artist/d2f37dfa-8c51-43e0-bdf0-cdad3c55687c.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 0x31848c1d63fdbdfa3f3175b5b62cc8ee3c8b106f9738573248e633cf6a8bd881. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QMSDU1500160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839a1b6cec85b0aecd5b6ebbf8676786355d583857fa96282928a944bd0925b9. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QMSDU1600055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0f24ecb8db1c13f87f48c2e4de643a37cdfa7e0627dfb0dd1ebd784f6793df. 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/QMSDU1700160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5053fb7e3f2fe16afa4f5fb059597f0e586e81d2a41c85ddad059a8582e8a28f. 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/QMSDU1700161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48407db6e4936ac35cb298a3e87b73cd88cd3cf126da04cbbdb050c02404ef01. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QMSDU1700163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7d7de1bad8078699d5c4db9c8c5e87e91970b412a4e4df2e977eea5cd885b7. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QMSDU1700164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7561d7511e1e19b372b02c25a88bc8af66872d82efc3f56f55b6170a1548d39f. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QMSDU1700166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25622b48ec5c4f3830af760dff427e25a466abdae6c37961518a27ac3ecd42a2. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QMSDU1700355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6c4e9add2032b25e57848e3250d6aefa356b72553b9a6e806d66bdde65e104. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QMSDU1900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766b28cf371c9fdd056f82e64399f0e2f933b24b680fea8887cf06e0de68ff40. 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/SEYOK1949013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02997ab628a909888f8ba063c0efafd236f9efcd4a7134753e8f847a4fc527fe. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:08:34Z), 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/SE5BU2197606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1385e895d8a57a157a0fe556e88659464864b2ddc638e44fcc05b7d94f7cb812. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZS652119204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69acacc50c7a200952bbec9f1f4191ad7b0dff2ad359b178477242b4108a95b9. 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/CA5KR0011069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cd83293ed5cb421a687dca7a4db5237f41d4131448902d1bd38578eea98160. 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/QZMHL2259142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbcc4ac3e08ff5138a031e6313e303cb8e18c6e6777330ff0fa833e92b5492a6. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:45:48Z), 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/QZMHK2013242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7790a2fd0f1aa7b47c001dca3d65d20b72d1bd5afdc87ae91c472454ac877ebf. 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/SE6TI2038107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd670cc3af5ffda4eea8a745dfb6f8de8aed0667c3b57f0d418ce14ea4e527bf. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZKDK2145988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66a1e5731cda01e7c52b55f305c9a5ba77036762b1a9fb0bdc5188fd46e4a4b. 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/QZMHL2097024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f3681de88405e947543946d0b543be832afef548b6b315516b0d2888fc2e19. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QM42K2242929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010910d776db7f6c3391de2f39b0dfa6e56675e685d32bf94b5b6c47817ae77c. 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/QZS632245617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79076ac0555577c8769087916a2f3c4cf441622a8e6254a9ef45342d421c21e5. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZS642396220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fba20df402bdeab139ff1b064034d40d6dbd3e157b2d0f7afeadd19d146b5c1. 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/USLZJ1602092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601fa92a2d733a6da1acb488cdd33e1012f3df1ed6a5a94da85c00067242fcee. 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/GBHAD1600053.