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 0x596a09062d189d23d334709ce764e409377ac8679227865830d42e58b6ee51fa. 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/db23acd6-0a3b-4baa-a48b-aa910f3dc208.json and https://artists.proofprofile.net/proofs/artist/db23acd6-0a3b-4baa-a48b-aa910f3dc208.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 0xf97fdcf16ef290fa92287770a772e68c45c481f3db7957611889cd05ca5cc725. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/USL4Q2343436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9506a90c3688ef00603ebdb913e2eda67c786bfcde70fd5ae70b347af36a061. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/USL4Q2343857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbdaa3b2a90a433274d420e81997dad8b30889c1ac015140d9f2e5a1aca6a873. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/USL4Q2343910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e09903faa1d552e1b467a1d075be9992fcf58c55e35b98f85e26fff27e89861. 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/USL4Q2343191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423c37d372ac1b0689fec08c763b8ca95bd2d5317c006742e43fa6a8c6bd7566. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USL4Q2343909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5655f69613eace20895f1a7448f84072372358d90ad4ac883cef512f59654b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USL4Q2343929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b6c7a5db46ab7af0a1bbaf8f4648c607147924c94f8ebd45b69d1b64c7a685. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USL4Q2343856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22095d701d839c4843934d6316c0e48f4fcbb838c51415d22d4fd44f0739f011. 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/USL4Q2343858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d31ae83b3cfdbd830cbd8c09603bd834ed743eef647afa26aaad7603925a9b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USL4Q2343908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44877627662f9c9a42b52aa273fbafe45596156527cba99e29a1e78bf357f64. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USL4Q2343927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e13694f047ea47890c44599a9104737cf1a52c79f0b8b2cd05b331c45d42b4c. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/USL4Q2343930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda7a44025285769e8d342a9687ee3115e943c44f0a9138a8c615292dffa8511. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USL4Q2344283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85e8927143701ffafa2ff2ddfd969a4f0240d93363d8647a2cdbfff38b8214f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USL4Q2343432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48440743b8a6d8400e31e9a0f3b0c45207e1730f36860ac12407c52aacb89d89. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USL4Q2344285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ddfec5159814c41c616f13675944b82ea405b98df78cd5c8a647a6d829a079. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USL4Q2343462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb24cdd24e9d9677b99834611125c08b185c35211b8b685e8cd101f9b3021bef. 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/USL4Q2355437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae18fd87e15b056bfba478a4e367739558e1f8822a68800d2a45d0f31c2fa8b. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USL4Q2345176.
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