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 0x42e2b9a3ef6cd37a790ebb9bcbd91b909650d0833829fda78759085dd540f62f. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03d628c9-1054-4a8f-8f23-9c2d1d0a4a01.json and https://artists.proofprofile.net/proofs/artist/03d628c9-1054-4a8f-8f23-9c2d1d0a4a01.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 0xd16b0ee132595262313006034a860c9e53104cf7c8898280465a6e952cc4764d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNMT2407959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86628131f36d552909903ffda674a742a594d9125cf5c8414a5773625b8501c8. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZNMT2411538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb097042cd44fd055465646c9c0568014025c5ce1f639060862a4f173e44c152. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZZ7L2466470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449228813d67c5fb9824128935fc0833b33e739f3eb1d10cf4ec82c54b0fe6f6. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZZ7L2466471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca42c0d92bfb2d548e33f0b7b64a20b7d15baed8e4a98dbe4a680d9d8d041475. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZZ7M2405849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ff66f51625dfcb228aaf52272a4c37d2c32b34e124d29155691b00f9de3fad. 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/QZZ7L2466469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef5f1f0eb1ef2ed3633d735588a9d40f9b228de87d50867c171ee019846268e. 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/QZFYX2517825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5547d03b9ba5b78bb26c464bc9cf0df1f228697a6900161afdcd4e34356732c7. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZFZ72520505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9fc74dd5c08094f24398db8adf8ad2b5f8ce5cb91b6968000924becf65e3e3. 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/QZDA52565058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20147060897c9540d6a0c37cb7c155b78d78ad16276a97d255eee7334654f96c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN32540992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050b9571f6b06828ec066e3292650d8d197b4066348daa5bd4c02faf43a40e50. 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/QZHN82522834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb754635c81fed977c57094e5fc2dd14a6f281cd86461d5c1bb3f6eb208f9107. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZHN92525775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681f14cad30b1e81c5884c758d97045b48723c7930fdcfe822e1a4a67557a07b. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZNWZ2576674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd62417e1f8fb50a4ce2a333a3866bd36946f68e1a886960a17035848fdb597. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QZTAW2568406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32f644b85a1940f0099dce351a1348ba112ac08c0eeb3bae5140a616905bfc1. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZWFE2575841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f448c31daacc2ffb74373f16dec8e63975902908e43fb0d078b90fa8f75bb5. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZWFK2583158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd75ed9eb9e700a034f2b1dbee29750a99fba0c828dbe9f3156cd0e6d455115. 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/QZWFR2595177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc59cf6b713dbf860f25bfa6f8303c6a892b239c7cfd1b148ee1f416f88d27ed. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT3EY2550526.