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 0xb9504be804db22eadf2478558b0c723bdc2b8937dbcb4c97847d0ba1bac165a7. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3771335-bde2-43a6-b7f9-8fef540769ef.json and https://artists.proofprofile.net/proofs/artist/d3771335-bde2-43a6-b7f9-8fef540769ef.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 0xc32b9a1cae858f2e39f7d0b13a2defca3bdf31be3bbbfa5fea68e8e77ccd65e2. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCJPQ2133199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3067bc2362d2bf7af3042b13f1a07930939cb544f0926e3f10d7fdcc43ace48. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QMDA72171801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900102727a5f21b64750e0160d5757504e3d4c02ad286f2685ca32b847a120d5. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCJPR2244101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15602c51fd833fb4de37de370cf9bec3f01a5550fd0800f5b7c5996cedd0875d. 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/TCJPR2274825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f69ca6fe6116a886c7c6b4c4fdf10b6e6834946648a6afaaf3e4fe8af5b42d. 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/JPZ922409506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7336b9894aa8aa6b2b2c9b6f3c3638632d5cc19cfd915cd6a8ea4171edb4112f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/JPZ922409505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404733676d7bc7f9afa53894a4e1e08a2cd494e9a6f5864c815a111a7a2fa257. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/JPZ922409507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32b9a1cae858f2e39f7d0b13a2defca3bdf31be3bbbfa5fea68e8e77ccd65e2. 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/TCJPQ2133199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e1a1057a4b0abff28919edbb0bf82ab89aec83d17c2d921677c48d1b23e56c. 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/JPZ922409508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a126d6e20d95721af59fa37b5170c97f130065300a4f7506b318b8bca3a74b. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/JPZ922409509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900102727a5f21b64750e0160d5757504e3d4c02ad286f2685ca32b847a120d5. 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/TCJPR2244101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527e08f78f46ac30e452523597ce0d27d7819f949304c2505916e006bc633b20. 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/JPZ922409510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15602c51fd833fb4de37de370cf9bec3f01a5550fd0800f5b7c5996cedd0875d. 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/TCJPR2274825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a897e2ae5e2f8fa08590d83190b6cc4deeecf0a0c14b091db4a616c248fdd3. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/JPZ922409511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b21bf100b8ba6834de59cefcdd19e1b681eecbfb1942fc150a343b65b6be6cc. 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/JPZ922507212.