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 0x811b0eb799353457f77c486d4a6ba9b87b9c3992327963555c36acb51bdf884b. 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/dae6598c-3879-4798-a0f8-6bc8d365105c.json and https://artists.proofprofile.net/proofs/artist/dae6598c-3879-4798-a0f8-6bc8d365105c.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 0x3ac40e84816222bddf14e9262e11963405a25fd06b28e5276c44183259d11bb8. 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/QZTAT2236806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26f4ce1c3a1d688b5209006173aa8f721e5ca57977d7659281e916b2334ffb8. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZHN32317490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a6d5fac457a48cd1ac67f1a6ba904926627e7a7e7bb129ea6b9cb0e147ae5c. 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/QZNWT2331227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e7b5bbec6b5937d4bc1564247b59c7db80cd19a4f959775d25f3c198e7c23d. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZMEM2492446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c20c6d78d0c38871169f41381f6922b6f05c78e1129c6ee68d2dda976a7e069. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZWFE2428113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188d4df4d602722cba4143468ef0fbd9477c6638891b444f9d9bec0fd95aceec. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWFV2413211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035a3b5a49ccf3a705175143933d6ede44c423e833ef99ec6456a8682b116e3d. 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/QZZ7K2478511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3908e7109045227704ddba32ec9f87fde07fe1b49655d52443538a978737ddd. 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/QZHN32523490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be8d90a272802547ef3d3ab56bbfe54fc873565eae24f0ef8fd8e91beee70ae. 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/QZHN62544706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c46b16b10ec76bbcc596ca00f22a5968e3afd7c7a6c091255cd811db9cf7668. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZHN92526691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea27e5b0fa5ee4305d8f8f869e45a8de0913fc96632949753c7080c2c13762f. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/QZK6Q2553086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa32eef6837749e0a12f20891c8f45c1fc77acb9819e16485439a020049fce9. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTAX2522633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4f6faa5002871b37a6094d59f6b7fcfd4741c8db985f10e0df7a73766d02ca. 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/QZTB62587206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4273a2c41463f63f3915d2efc46de26b777fd6df17142a3bd2c27a54d1f5b4b3. 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/QZWFH2599212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81962c62b09f51260e4e63e1fedfd8b39b00ff57310860e8931fdc3e0f898679. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QT3F42593876.