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 0xadd7d469a39a3bfc713d7f8b560cd247878d3d0691f2680a663972f9cb93b0ec. 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/4a44822f-46f6-4fa4-8f74-8dbcb0f11a13.json and https://artists.proofprofile.net/proofs/artist/4a44822f-46f6-4fa4-8f74-8dbcb0f11a13.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 0xdc3ce6b5fbd0cdfebec2e9e684122cc109f3a1c6f098be88dd51abc682c7f095. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QM6P42218992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf45c9a4ab1fa3e5f0301c2edb907b4e489eda445651e5f508f527b2a0b5e54f. 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/QMDA72214307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4045955f9f74228d327242c9e4855a6277369c23c24873b6b8c65b8a8dd8f55c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTB82210612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549600d9f87fcc082329897872998ca52a450ef5a165e0c8d9a0b8d959f7d1de. 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/GX8LE2236462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f66200ff314f44e071bde5d7d253a3fe0b8e2f2d0f355685ba834ed37643b7. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/GX8LE2266295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bedb6569378e6135bf828cd957d248a3da274fd63263b65da0bb5aa02981e8. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/GX8KD2347929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5013f6165a1f3692a300e5658d2d722ef1a2b1f94cdd2f1073eaeaa5ec76c42b. 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/FR8FB2303000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bcae70929336c5d62a100424741e20d33631d9cb80eb522e080ec8b10db6b9. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZK6K2317555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4116346b61900943d97ae9a0437931513ba5f2073679b254dcf0004f1542d872. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTAZ2310002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920056b7c1bb2c544f58c8f358ed0401af19b6c4f5e96033c1f885c19a2cf58d. 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/QMANG2218470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9f7391cb9e112a0ae9a522511a48e833629d8030252d88530160d257ba245a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFYX2454882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e06fe6d88668c8a3e724faa9121fa01a058ed31c04103fccf4a619d095075f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZDA42423390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1564e78ab1967aa6286c7f95f8efd60f771763f46f6a34cbbfb09671a89949. 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/QZHN52416412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418336101214b362789902196fa9164b7542156be6d4568b91aedc135243758b. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZHNC2423795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b78901bd6ddd1db5f57ad797374067479f33bb0cd2dfabb90339b4f8b5860b. 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/US3DF2460413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee27de2fd09a8aa35b0dc24c489189a9a71d6b2866f6a9985d23216640f98c5. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/US3DF2496363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1f7b19cfb2a52c1fd1b57aaec035ef98bf7a05788488d511cfa5950399f680. 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/USANG2408590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ca7dd61dce7312ffb0fa47db45355ded80e44f70667098eccd4450dd97eb04. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZTBA2469250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed017614cec4ee09dffc24bd74bd7ea21d8f4d3b0827a0133ea4938ec30cc509. 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/UKZGC2503693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfc3bf55fc510a40a529ba3d53906320995bd14fbc96b255581d526e9b900f2. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/US3DF2547646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977cc970a1c4441b661be7bae04843e8491316486fef0d0a8b991ca63581b6f2. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GXBDS2513079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5b68551d977a17ade1e9817649acddbba89260e8949feefd95e139fd81cd56. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/GXESV2575994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1f7b19cfb2a52c1fd1b57aaec035ef98bf7a05788488d511cfa5950399f680. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USANG2408590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3a30325d33ae72d51cd5a8c52bf7001fcf225757dacebbbeef904eb3a09330. 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/QM3DF2273098.