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 0xc3e0d7c9a4760d1a3e6ccfb5573c9137ea8f46dd4aed23f69684562077c03a8d. 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/65fb4fe2-6863-4628-8c1b-d9b01909a57e.json and https://artists.proofprofile.net/proofs/artist/65fb4fe2-6863-4628-8c1b-d9b01909a57e.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 0xc3f30f3e989021d11beca03ef86d07ee0b819d6faddcf42df06907b738a73af2. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/GBWUL2067545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb313dca609248f65cf486f317235f99c6a4a54349406e981e9277596d793e4db. 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/QZ5FN2055674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f920bd65cf7be5f4a8afce61ad740612c3877cffa283a6aa38baf4ef8d2489. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/USLZJ2102976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccce116f78c97ae7286ed37e03924768ed402a7811d7b92b6c040eb76570e0f3. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GBWUL2148668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2c7ea16d353ba5689c22c2e117955ea28aaf2a9ba8687a22a50b8a6e446ec1. 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/GBWUL2148670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371cae10dac0346f2c5624633cdf5f014033c1cf9d7a49d35baf18de63b1e0d9. 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/QZK6J2202593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e7fda500be092b65968dc04c9c953fe9b99049bfb6c8e729d68c0ab0d1fbcc. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTRX2220373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e29726ec2dd2d71e25505a3d28102f35bebbfa88edf6cdbcf993c312ee58d65. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZGLS2394088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465e65b74943a71e88ce2e1ff41619a1edd8ec8127b56fd0004bea49fc3a619. 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/QZNJY2367949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e55d499aeb7fc14af905875f4ee4a706ac565cde28b8d98197e9338d89fcdd. 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/QZTBC2378007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b66b7a1aef5b6a2281e28f2e0c1a22db627ae5dfa37a748bc22416f7285991c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA82406620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1e3687664f55e91a6ce584dedd614a4023186db56d5319856ee904490a2c6b. 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/QZHN72453439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493dce5da81894dc931730511d2e1096b79f8a2c51bb31b83f75119263a1e36f. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZK6L2491680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55056f58309a24af705d739bcf7b67455d239124ba441bc19975ad80fe0847ce. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZNWU2469090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe688497a5e894d8a8166d6986d2886eade1d73159fe3a1a0069e5d5aa8156ccd. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZTB42452360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b4a65cdc09e390a5975330ccbc242158b516c80c68b9f4cedb8dc028925b2a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFM2400393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120b7bc1c653561e785ec8569b3fe0737484c317247f6fac6513ddc05a41f8c5. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QT3EY2442610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3d9eea8e82109b8dafd9c2da1886faf33fd3ee8ce3c8324d892778cfa74c0e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZFZ72557640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf156b2506922d46bfb3ba317d9cd8189d16d1b32e0eb54a3dbb5ede1d5c3910c. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZES92501852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf093e40da38ceac6854dd2a86bf3ed2b264f7940c5b652eb00874613a2aa04ae. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZMEQ2513297.