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 0x67e49d5170199ad13d7971286f6578776ccd7dfa5482052514a39001f9438b1f. 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/9f6093ef-6c81-4e4b-9fbf-55a29652fe9a.json and https://artists.proofprofile.net/proofs/artist/9f6093ef-6c81-4e4b-9fbf-55a29652fe9a.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 0xc7d55ab5d55d1feef16a4bcca3c6845ab732e0650caa020c1a48b1a994e3e74e. 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/QZEQU2128996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80433967573c258d32e38f9e1ba0795e07d69bb2f5955579dce3eee46d95f873. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZEQU2301439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354386d3f14bad6743f3a5d0f6bca0b231df2ea38a8164cab5a00376ea3cc0d6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZEQU2301445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce334a76b6141f94cccda4367f2b36562fda125fb24c83011f07f3f080d14565. 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/QZEQU2301732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1471afc237c630cffea1292914366afe1f6e226fbf01bc32f993326b22066eff. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZEQU2301733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9db7909576a075bc4e578aad4067c4334783ffc0335dedcaaac3999f3a290e3. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZEQU2301735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4d841a1574fde5337b24bf023faa38129528b6b085beca31423d45526f77a0. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZEQU2400503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe978ff3ec36ba4896ec2d7931c75855504665f026e7136eaea0e2e187610694. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZEQU2401368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2836322d0a83a6daf6744feeacf731c6d41d4bfba55c34bed6ab5e8f603c7d8c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZEQU2401371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84644be9842fc18d1a18975ac557da6378dd69969208d9f4026b8aecbebd2cf6. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZEQU2401372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a8e25ad17f53d33d5788c9eda41296c38b0f349684df3ed11b40ccabb44ec0. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZEQU2301974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ec699cdd797920a5078efe7d7f0c55d230506797b32be83ce7ec95ff4d0d1c. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QM24S2406845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5886fe44b3087ea998957b0a5f6b09e6a3c2ae41ba9bfa8403f206b2aff45da. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QM24S2406844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa349755747f7cc954987e3c6042db0b1b0758b7c6a687359c8b9d2c5651bd425. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QM24S2406842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ab0aa83fe09c5903d4be0f15fc5798078478bd8e0d1ea9e96046f4257bfa53. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZEQU2402378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506774e2752b795379e1da3efcf085fea96fc0487f51d9e05a75aaa7b0bb8946. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZEQU2402379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4360ff1fb3addfc15d9b790c9399e248a06ec194eb39f19bea9a021a2f6d411. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZEQU2500207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3c96ea2a4218f01b252971622676987c49a2e0808ebc3224292fe46dfc810d. 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/QZEQU2500502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d55ab5d55d1feef16a4bcca3c6845ab732e0650caa020c1a48b1a994e3e74e. 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/QZEQU2128996.