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 0x1fd1459e6bdbbb77ae503e5e13210d2b00d098a9dfb6459d9b077af18ed8ec6d. 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/ccbfb1a5-9f20-4a83-8c36-32619781d7b2.json and https://artists.proofprofile.net/proofs/artist/ccbfb1a5-9f20-4a83-8c36-32619781d7b2.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 0x27140fa680df61dc5c77136f05149b769d3e87acc3b780dfbea448435e329c1f. 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/QZHN72023215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3aa9700e0fa4b5ecca6e6fe3eb6cef74a23f7efc5ff21b28505e9b75833063. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNC2052787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c58d7e399d1c67c7233ccbb906a119e8d46190bc5f36a8d0c6b740360c3398. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6K2049578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7243684ca52337017bc3224fcd9f68b8790025694a7619b9c4546a83713a19a7. 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/QZNWT2026360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2615ca26db52c87a2e989f22f5dcff46ebe56e9995a31962479867286b64a0ae. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZNWT2029790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de4eedb5b39dba65b0409747fed398c059d1fee3559e60fd93d2be1287e90a6. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZNWT2029791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeee30d057ed6284a3c3f6d104c5dd51db33a8bc03cd9f4fbdfe4a5894947f53. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZMEP2033657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94d59fa0e53f54361fc72f8c26bd94b4225e58aa39243877e96940ae30d078a. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZNWT2029798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06f587d26c7bc1d52449fcfbcd1d5630e32710add81af6f4955f1a495955fe6. 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/QZNWT2029800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe210f840163d8ac92411a3bdcca0d949bcd1aa9c3c5423f5c1bbe1d579037e9f. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZFZ62178256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a9327f2772dfb34d905e04b82ab730c2420e8fdfeecb2b6b9627bb321a07a9. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDA82168055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21e8d551c92ab72053d41b50dd199c7a657897a7648c9d131ed64cc68ad3dd7. 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/QZHN92235657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7057a445ca16660281bee3c35e8715632f2d3938a44503dcbfac401a2c7a66f8. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZK6J2248551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebe46999f9c43f20803313987229486bb4eefe12fb4a5d045ed707b45cc11d2. 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/QZTB72223418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557315518e7402f7358366a0f353331c42f991a62819a9f8d0508624fe9ebdcb. 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/QZTB72223420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041c6883cea589ff0593f85b7418817bd92584833a5d45e507f12c55df2bb542. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZTB72223424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4090ed430aa3d49d312da4cedd32942213d1929dde7c0d55a42f99b7a3fbbb. 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/QZTB72223431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe994fc16b1583910f1cfb497a6e776566457a699bc44ef95f7069c8e1b3d324. 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/QZDA62320901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e910fe9176ec306bd5086d9a3f00035eed6ab62787ea408592a772333c7ea0. 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/QZES52393700.