thumb|right|Two ogee curve examples with their extended S shapes, concave over convex (cyma recta), and convex over concave (cyma reversa), representing the cross-sections of two types of decorative m
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 0x663cd4c4bb5d0ff26691e3e87dfe06cc5874c8188ca8d355ea7b7b6c721e22dc. 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/bfcd5546-0fcb-42fb-8bf5-d71e7a1b4f4c.json and https://artists.proofprofile.net/proofs/artist/bfcd5546-0fcb-42fb-8bf5-d71e7a1b4f4c.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 0x9dfc0953a3ba0a8822b15cf6d368c6c86e83a75a7cda2880cc270ba8de2c7236. 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/FR16W2000460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c80ab37c4d673e8929cc33402dc048fc630d8990203b2bfa868b7ff1ec802e. 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/FR16W2100490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abbac091927963fcaeaf8b084b067d24271f4685f799dedcbcc3c725a903407. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FR16W2100680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1e395052fa2c53afc8455848d1330bef8e5fc09c9da4382248421594dc0dd8. 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/FR16W2100700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4480da80c06913c9130fe2f688cf30e77a475dc70db99edb4d93bd8e06c138fc. 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/FR16W2101430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d29b0aa4a5fd37360477a1559b6510b6af0ff8f14a7d78355c123fdec250e4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR16W2101420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce911a187962e6a4ab4687648ebb4e5015fcca791933bc213175c0127d980c99. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/FR16W2101440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9605da8b44c5b8ab36e44738443c0c2c69d07247157353ae892ac53a9647c04f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR16W2101470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e6ff531da51c4653451bcadd92c724a2a06d4a6ad39fc597af51b042933e9b. 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/FR16W2101460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e005ce10a107a33d75b0ef4b042aff3d492be329d7ef821409f72e34ff05952. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/FR16W2100610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5be87092978dd0b3ff564d20db861d25c84a04738177688d5a11432b53f34b. 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/FR16W2101500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35cd495de1df99061979e25bbd3e286c26dbeef0e3ed1e2d20d7849a098410c. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/FR16W2101450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4480da80c06913c9130fe2f688cf30e77a475dc70db99edb4d93bd8e06c138fc. 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/FR16W2101430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9605da8b44c5b8ab36e44738443c0c2c69d07247157353ae892ac53a9647c04f. 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/FR16W2101470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23f921f901595f26a1851e8857d008977f5f952e67de69ac3d95f27eb415fad. 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/FR16W2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abbac091927963fcaeaf8b084b067d24271f4685f799dedcbcc3c725a903407. 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/FR16W2100680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4531813845411dce3e5f603d6133abba42313fcdc8e390efc297e1c998ab11f. 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/FR16W2101490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aefd5d9d0a9f1bb4f025113453360d050b4844e60c19829dc95bfa8c6ef7d67. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QMFME2361196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786cc8134a7789c409af48a842ce24e22445fbc55c62734675cf44d2f8632b36. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/FR9W12536172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3813d7ca0893af790a0f8db958b7ddb50ae337368e5bcfb58f04fcd5dc3548cd. 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/FR9W12536173.