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 0x25d27e43aec12e4dd869ff5ace3f9f769971559b4090a710e8dba6a181f27c4d. 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/47b19308-c9f3-4fa9-b22e-d3cf9e5bed77.json and https://artists.proofprofile.net/proofs/artist/47b19308-c9f3-4fa9-b22e-d3cf9e5bed77.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 0x96493bf4140c28fd26587e60e5de5e640e3935d44f17057d306e7bc0fcb930a1. 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/QZNWX2274732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66876188b4f18ba643eecbc40b1d005a826926bac0ed1c36e77517414898ceb. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QM3DF2266798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce67c19dd0a44a4465331b99ce3300aaf3d21259eaf932640419489948e4595. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZRP42388141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc8acea857d3b97b4ce7c4c2f0f4093dfe834116933ca9d11ab0a9ff2a18e09. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZTAY2305588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f35fad85bd93341d679427aef130fd9c8a25ea0628591ca3dc85a01ced7b76. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/QZTB72352608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3256e4698f4723e00e58a9ca80f46c5728f6e39e223b19399e5d75fee465aa03. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/UKZGC2307944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56ad88ffdb55ce2e9c4b68f6dbb62381040ce7ac3e093ea4dae4c78f6c53876. 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/UKZGC2307947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb161266ff4875b8bd23ebb151672170d79e98b199b5d392f705b54ae1aebf76c. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QMANG2237541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d328ac29458898312b35d341cb67ba650a2bf83bd7a727617ee51fbe9941da1. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/US3DF2419520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368ac13e6e5f395f4579f241560e68a190af99a496e6673777c1593e77f9f9a0. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/US3DF2419521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a04815a5ad25ecd28a4d125b8dceef8466c05ede28e3425de5eafb59d6a524. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/US3DF2427359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755fe4cc5afe978d44f9b269b15900b3cf7e757beb3aadc6269d7c78ebd4a066. 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/QZK6Q2441876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90645b63a7146aab2cfffc7627335e2361f2ceacd3383fc99971434cf194f190. 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/QZNWW2414376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90645b63a7146aab2cfffc7627335e2361f2ceacd3383fc99971434cf194f190. 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/QZNWW2414376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90645b63a7146aab2cfffc7627335e2361f2ceacd3383fc99971434cf194f190. 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/QZNWW2414376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c46ad042ae4482914ce740ef3800c710572ee050ad4ffd6f5ffc75fabdba8b0. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZNWX2405599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a16fe74f66708cf6222795d1b8928b432d4e5588b9069bcf6f8d65880bc6bf0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZNWX2446268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9772baaa1098e7e4cbbeb23a44cab5029a1299fad32e237367ebba780656b263. 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/QZNWX2481970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebcd8c092252c5772b14e374e856b31d5c5d267e7753abbe2be8e93abb5a3e6. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZNWX2481971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3cded9581e93ae5edad22be266ec61cdecc57351a89e9b712811d8f22ebe82. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/USANG2479862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ec46458cc53015cbf9999059614df376c3bb260476a4c52843aa6d9b44bc6a. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USANG2479864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddd4fe4e4061e9fc8c8ded1d41277849c94cb4a8e1b158b0a0385cb87c01962. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/US3DF2514589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff77798287d46fe27b9a20fac705b8d2c12e2e99a24ab87346aa8b88a387b406. 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/DEH742515843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb54891b7678233506e61f7c2e2ab9c5b8458dde1f6111dd5757193d48a5331. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/US3DF2586872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf259bb575f7b376073914c256c72399a307f7fc57ef67c81493d163b530b2327. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/US3DF2586873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc27edeb4b3f3aa3fbe5e49f9506763b038f346483aad81749360206fbc8db8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH7812545078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333f2663654fa4bcd68fddaac2b122e7a7287f80f85b08c7e6ab28c02ca3aaed. 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/QZNWU2240901.