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 0x0f341777774a00c25b463ed52df276e874e2c1576ccbd8730ba05ac6e8f5aef1. 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/0d63929c-4f2c-408b-8266-fd3483887e69.json and https://artists.proofprofile.net/proofs/artist/0d63929c-4f2c-408b-8266-fd3483887e69.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 0xa603dc8329542282cfc180d3b2c949f2862c3557c24fc44eba26174634803367. 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/QZX882507477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dd2c038dd3900f230353396bcb8effa288018dfbe80d198adec0f32ee811d2. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/FR96X1911230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6edce8401c9716c97164d149199d6a5e5e4b12b4a49ddac6f9ad56a602bf686. 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/QM42K1960791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffcfa459b6509c4bb3c8653893c7ce3400de0ebf22ad34999fe3a7af4fe12e5. 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/QZPEW2549245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344ab5c1bd088b29e0d632db3463f57b2b31d0ee922111dc329a8bf31ae93cc7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMHM2040726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddde4264e610f17b6fc5e9fffdd87a5fffac185b7961104b62bb46d5c0e5ffc. 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/RUA1D2133621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d783deb774b2ad54b2e157393fd37534a635175f360d0379606cfa6bd050ea2. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/RUUM72100823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e1d89e66cabb5fdff310357445e4ec43891e4659401725934b685549253f30. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FRS182144175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746e3ac3fd07ba430373fab1cc6c1f6dde0d280b4272ec65cdcd0c889d45a00f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZPEW2511155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5b764bbe58e0ac4f3674c01411b1fe6bd0e86944c8b2dd3b131fd0bcf3e6cc. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZPEW2518620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b567c8512499910975126ff0cf68d1ca84ac1d6a3f6c6f888e8ebf24384790. 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/QZPEW2518621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a1f93a2df74d19daf055e241aa4db1535e6556b4006f1d4f4ba35407c2d428. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNJW2468984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda67ca9664db406901f5cc4b6175ab4071ee2f2f218952aca4f1766908051719. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/GXESV2406376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fe495adb95789291ddd1366d79f33a1fdfb23b38b355a0c4ca536e745664b2. 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/GXESV2432080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ff758f53cae28d14489be350fb36919d8f2599863a340b1c5c9b9ee715f7dd. 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/QZW9K2452580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6969ffd0366792de89b7061494963f3da1fb756a6a639b5c1c1d278ad7713f14. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZVEM1886417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db5a820af9080fd2c93599552aed1616ba51a4ca83b1761916b3efe6c99199f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZVEM1886418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7893dcaf8a2cbbb9d5d839abeb275869ba92cb85a3cd85fa5b818124fd6184. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZPEW2580578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878d0c7f5fcbd2539e5e167fe24aefe54a74849bdaa4d9810f4e370a9f039212. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FRX282582336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb61e1cbb097c2c6146d4ebca4016afe6d634d686197977275feeff6499647a. 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/QZNJW2567086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2210fb2769a15578ce4c8598a748f1afb8b1098142308577aad9b7fb9a8ed9f3. 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/QZNJY2537252.