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 0x92c83c92120cb0ccccca7abb183c09f47cb6b19bd37479a2b2d441264948ba1d. 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/1c438b4f-a99d-43f6-9d36-3fb6265266c2.json and https://artists.proofprofile.net/proofs/artist/1c438b4f-a99d-43f6-9d36-3fb6265266c2.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 0xa08cf75031730a40614b966a34f00c32ef5ccc32c4812778f4e9672f023baeff. 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/FR0U91400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc841500ea87ca2ba788780be9aa39f15593c5226befd71d940940dd9fee08e9a. 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/FR0U91601811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b5ae802f360abdcbd74b39f4b640093c1d5d5d54dde43022ba83fd30c06837. 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/FR0U91701176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d44268025d71226f1fd0f0900b72427e0122936a623efe3e4b9d1251aa4c11. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/FR0U91701178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58e4b81c1366e174690ebc394f9999b3e2d117ab3310829cdd5d0a837584518. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/FR9W11825262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3951af704a0739d1868f671ce4073ca31542f121e15fd4941ef4c4848d82d2a. 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/FR9W11825267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf818a0bae03d4cff0a6390cc0423bc05da0969f31fa730774aa24a4702d98064. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/FR9W11825399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bd7f1f7eb2ce6858e05dea6f0b7efa72064e8d68725ce583eb6397a088c858. 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/FR9W11825270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f76e0f06af56270c5d03ef6abf236ea2b104e3c27f8757e42490c581c34f600. 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/FR9W11825271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285e40fbef141090699bf95b01b4f36eee74eb3897be73895277ac143cbe3c41. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/FR9W11908829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29fcd6e05c189f5adec80a0b45900d2fdee171a8f0a2bf2a6b34606281df851. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/FR9W11914598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b73980638236d2d3c8040a394aaf8aa9a8a79d95b3759456f4be2631d4be43. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/FR9W11923165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2cc4cf88a9b3b36b2ef9d87cf6b51986fb88350bafb36994dd8be53a041b00. 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/FR9W12007038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989d317076cd02a27b2448138f66587c433cee3a585b6e9f616cb22eb780ff26. 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/FR9W12008932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbca3f74837e6593e726f503ab95d7b4b7450545e20b07ba174a13c32c454933. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/FXQ692100159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7049dc6dadce24054bc750163ffe4edb7864e72535a54680b34aab11a937da46. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FXQ692100251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb25d5efe04a8468a1e8bc787ca7f03f633bcdee7448bf387009084a8bbedd9a. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/FXQ692100319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd21d9a4ac9fe766eaecf660b804d06e4ccbb98623452d5c3dabcd38926f003a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/FXQ692100328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582dfcb10604e31790ac9853ef36cf2de98feb4883c37e47bdecb8f08c488516. 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/FXQ692100355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6813de3345c78093d213fa469c1df8c3ea53121964f6dfc03d90eea8048544. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/FXQ692200078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e352cbe231ad71e23cb523154deaef4012162f724e868a4edaf53b8e3c35b5. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/FXQ692200211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf275e6385896b8a0145a4ace13a2f001c4a231670538edd1b1e5c709e9fcd514. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/FXQ692200286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bd75e31d9de426a5958dfe1b77f64fcf17dbe82abc6777042c55602b5881e0. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/FXQ692400267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fc59be883c060402c2fc2d51f9c8d9650ef7b86df8f59a38ab000bd4e41225. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FXQ692500196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ff1d63e2bdbc2d9c51f5d81f2fc7e16a14665ddb1da1d7cdae3322c0cb57d0. 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/FXQ692500243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b05e3ef5c1b077bc53f33b76967e168a8a6a7a9d3d419f824ec735091cd09c. 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/NLS161801463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3ebc21d835553550d5f923cdafdafa6f6b0fab6261b0c0156416d0e20565b2. 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/CH6541767251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a7a47e5bf6539042ae6a4638ac29b6205855ca6e26487bf8048bf4ac4e13a5. 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/FXQ692400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b05e3ef5c1b077bc53f33b76967e168a8a6a7a9d3d419f824ec735091cd09c. 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/NLS161801463.