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 0xda2fe830711ae19f9e0fde5e6b3faf28797f74a3d17d348ac531e2ec8fb83145. 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/c955ded5-d028-40d5-9595-f32ab3061ecd.json and https://artists.proofprofile.net/proofs/artist/c955ded5-d028-40d5-9595-f32ab3061ecd.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 0x9c354408ec93e87f7dffed83bc1bdba33d1d52ab8028a00418733f6044230080. 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/QZES62006894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769f1266f9044f9e414472570b15f458072be46b244bb8727dd9fb9722b1fb41. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHN32078834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508ada01292b0183de337b26e0d458ec4cd2b8371b0762b7776d880c33c1a9a5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZK6J2080838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e6c1065195e20661ef6eec0359bf513de94d274aa6fed7b6770642863f7d2a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWX2099487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6da4a648bb41999bf34aed1546f505f2fce03d56e5ba0059d665e7a7ecd29da. 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/QZK6L2104045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44b98039c01322af5e34b7bf7990b3a9c9bd61fab16fbebdf57b9cc648a9c2b. 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/QZK6H2142888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79aac5c1117fc04552f2317836ef844ebecb66a35a3e53391663c71325c5cfe. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZNWU2104931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51e531a4a56764892177d34b27260d2f12c944bba0d4c390aab930b8fdbf6e6. 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/QZK6P2393286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72474cbd1183b00244421ad011a62f8fddd1269470718d9ccdf43cf97653e41. 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/QZNWZ2395386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdc39d094ca807c31d6130ed837ccdaa7c5c80ce9fcb0063de5be24010b273c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTAS2433924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9fe61c6b7fca1350d16feada1c75eb20c9eefc712e98ee922bff227d7ea500. 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/QZTBD2480686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23475f39be91730b98d5f33b9b9529b1931d1eb3c3e7939dd3d8b3ef5e384dda. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZWFE2435080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f37dd36cf658e9e3111c878126de6380f9c2f29af4365d33aefc39f06aef222. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZWFG2477839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724660ba45d3190976836bed5fec29b7b98fe4d8736411a954064a80b4b4f23b. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZWFM2452438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf155add51de15c6f1c924ee81189b6218ff2dba3cd7860c9f15bce1828d2833. 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/QZWFP2486334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356aec3832d34f4b0bef7460ea12f5e12f120ba8e459254ca47a66836aac9e92. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZWFS2466214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf905d17801fad66fadbba5d60e6003eaf524b3afad2eb4cefaf4fffe9a738b4. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTAX2502892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb4e1d8814e8d611f1f66c62af250601cd6d39debe06ec212fa6e6c7ea2864d. 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/QZTB52501756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5ff049f9485abd19ea00378b39709d843bb7e4010bb8f8e2650e2337703576. 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/QZZ7N2434108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc025ba73565a3f815c42f90050ca6b383637f70f21e1d11cd794591f72f5923b. 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/QZZ7N2434115.