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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4303b37dbb8e7035c9a617ec646596bd6e4133bb2bc4aef2e0770b25b1a2dd2. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34b3cb00-5b99-4d01-a7ef-1dd8d2a02498.json and https://artists.proofprofile.net/proofs/artist/34b3cb00-5b99-4d01-a7ef-1dd8d2a02498.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bottesini 2021 - A 200th Anniversary Celebration
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9755c06a088d093da81e37692752366caacfb2350523a1758d3661e50ba958fe. 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/TCAHB2317942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf563fc7b8a18c4ce96aef5b4f6f2603306c69c55c14ae544316aa3030c1935e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAHB2317952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376f75d87f5051baa40cefc2e1be686f63f07126ee4e2d7641f41d5c84ae1e86. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAHB2318052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04751c2c08b3cfdfbcc71ef5322e3706d728c2b573fc8b410658c61ba834fc5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAHB2317997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82751ce54ff0ca9fa04951342865dd46b0678da57128457a8e6b8bcc57a87153. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAHB2318004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f1eb2ab2c8678252165d98a421144044c61a69f25a42b3985d7665912b68ff. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAHB2317980.
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 0xb19cb8a198162eea04b512f476ba5ddc7bc616f75856ddfab4ee1a9c35a9abec. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/TCAHB2318008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe049e4f0660ed7e54ef7f8608b67d3ba08d9216f41bc13854dce2b6a69b8a0d7. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/TCAHB2317956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6ac9a288ed7240740229c184524ccea5a1b563c48fa2d5aeb9c7be84928d5c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAHB2317935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b719426f14cb6d91f9ffd5276ca33570691bf00079a00d0bf9aa0cebaf2d452. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAHB2317987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba69125e0a46bd8f5d69214b728cf6d5646b7da39e70c3ff43a32ce10a979464. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAHB2318027.
Introduction and Variations on "the Carnival of Venice"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5a6a250d0fee5ff37dd9e7f3b6bcf866b6d67921d0b440a844e555399fd941. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TCAHB2317975.
Variations on "Nel Cor Più Non Mi Sento"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79888a9082895530c407e8cf8f9458560f09ba48f0dcc8d63afe8080d705495. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TCAHB2318046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9531c8945bb7e3c58a5a7c20b44706d92d6bb8934d9be76022d17093470ba586. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCAHB2317950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196bc24a4bc9fdaebe6663d87ff02616b732900846799616d6a629ec2f1ef0a5. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TCAHB2318042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03cfc9db33a3b1e176aeb8d1829726248aa878aa9c9944acee9c1f12e4e982d. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/TCAHB2318055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31df33f89a58b25fb6f9e3318214c1185ff2e76e435cb5bff7c5c6dd74c5125. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TCAHB2318058.