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 0x627f14954db6265184eee177090e1ca2756bb308d528891152722bfebc69a3c1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e386585-e3fe-4d85-8534-061fac813c6b.json and https://artists.proofprofile.net/proofs/artist/6e386585-e3fe-4d85-8534-061fac813c6b.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 0xcb0cafd60de6f3655f0257380cee8f4d3e4383c4c27a8a1a8f6793efd5a6f0a0. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USHK92329301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7846cfcc8f8fd517d3260bbe9393defd36d8ecc2ecd44a4da009b950c75aed. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHK92329304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a77285eb72c4bf4796698bdeb9044d12c24c00c06357c1333adab242e65bd1c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHK92225004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c222180c84b50ac9f72b88a12e29a1ceed9fac1020bdd830a73daad5053b4d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USHK92123001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04965e4e13f4ebc6dfc9e74b84eb1380067b9d6ff356e48b9f92db497ce2c0c. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USHK92123005.
Tim Lane Performs Works for Flute by Ivar Lunde, Jr.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2ddbb6a792690dd806ffc8a84757866006e4ff696d6c30920448ebc01f07ee. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCABS1489844.
William Babell: Nine Sonatas for Oboe and Continuo
Without the Light of the Sky, Time is Lost - Excerpt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eaf3ee22419fe572d5ec2e3cb044d8ae2b574cc8e5ec0bdd14f12f0b77ab9bc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHK92240307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20aed146f5633668b90f28857bbeadc10f1ccc651ae0bd61548e0feab92947da. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHK92431501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652d11cec490a68a8f54e556276efd43754465b800b18d88701219186972f218. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHK92431502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca05d6c55b02ef757d2f55f2fd64a7ebb14dd3cb433f83b578df0117616465ef. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USHK92431504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8dfe51f666f5093f2b97749c65094e15eef163a9cd7c4780f438fadec9acb37. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHK92431505.