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 0x0bfbde55de9eb9c94257a349bfab3573cdfb75d30e11ae1f5be7d8d81fb6a8b0. 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/23ea272d-47b5-4368-a6a6-00345d8fda24.json and https://artists.proofprofile.net/proofs/artist/23ea272d-47b5-4368-a6a6-00345d8fda24.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 0xd02606fc02af76d9a5baf15eedd24d46ecf9c97dba7dcbdaec4928b90a4e1b4d. 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/QZNJZ2226997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151015e09173072ea8a28b053554c128725451a4e80cde919969a90b469087f9. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZW9N2250053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151015e09173072ea8a28b053554c128725451a4e80cde919969a90b469087f9. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZW9N2250053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151015e09173072ea8a28b053554c128725451a4e80cde919969a90b469087f9. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZW9N2250053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846e43a8652582c46593e50ed6ea5fcd67500eff58196efeb7ab77fb7574d0cd. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZGLS2370215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ceb80472d96e4cfb2e8197d6e93f2cdcc9e21be664a341664ae30788815532. 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/QZK6N2323128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8112e381b15f1405886271d940ddc898a26c537139fdaab123ecc27195c2f16a. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZMEM2311871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b28a66e7f84ad4856cf1cc0bfa9fe13f564a0d5f2cc1d4bedf2f72c7283138a. 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/QZTB32339018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862aaa5eba715bfeaa9ab1ccb892da19f31edc9529e11c74ed9190d3f1523327. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZTBB2356590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ada0df926625d06ea9001c4622a2a71eae042d07ac9b7770bb1f9591916dc2. 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/QZWFH2377969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544f559b38da3fc106858cdcab4f87e2987f102818cd010d8cd3cc433b64e39c. 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/QZES92401397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccac899329883e82b4801a68a4185d59ac6700173334e173926e57c81df42924. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAU2485114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccac899329883e82b4801a68a4185d59ac6700173334e173926e57c81df42924. 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/QZTAU2485114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd8e425235fc24f92817f807c9b71636aa39e7b4bcdf9d040c1688e3ed0df8b. 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/QZWFE2410487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd8e425235fc24f92817f807c9b71636aa39e7b4bcdf9d040c1688e3ed0df8b. 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/QZWFE2410487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b9cb7db03cdd462bb7ee27e5993feb1bf88d59d89ab442a907920eaa60cc5a. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/QZZ7L2403877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32321b126a9091065fd3ea38c6229c339a01df2e3e3a9c432c9ed9d54f70b18. 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/QZFYZ2523513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32321b126a9091065fd3ea38c6229c339a01df2e3e3a9c432c9ed9d54f70b18. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFYZ2523513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625dbe116efb617b86eb160bf6d58cd78be9b6b1f17c36b0e6b6c60507b7d171. 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/QZHNC2555705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625dbe116efb617b86eb160bf6d58cd78be9b6b1f17c36b0e6b6c60507b7d171. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHNC2555705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08b1d83891d6d6dd952101ca51b2f5a4668721043c4e81ccf1d9c6c73505f64. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZK6L2545494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c25b42e774894a2641eff45e84dae934decbaeacd3e4665e4c94f25117261ff. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QMBZ92509821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c913da0b674eba126dfb39c4e193937f86aa8bedf1c79e74eadc0813dfc61c. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QMDA62567014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6319a4784266e5e78fb8ed41a758a538aa2eb68e599b6f4445d2ab97440c0f19. 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/QZN882442806.