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 0x6f90dc06ac7c3ebdd87ea9153e4206fa5061a0d24728e7b18186d1dcabee1ad2. 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/1800515e-a20f-4fa5-8359-fa63841f44ea.json and https://artists.proofprofile.net/proofs/artist/1800515e-a20f-4fa5-8359-fa63841f44ea.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 0x5b574fc86875e231129f21ad1a37dfb90ee2380836da32848ccf839b83844e4e. 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/TWU712101633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0c33ca092798660bef038f341a82044c95b5efdb06cce0497fabac27fca30b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TWU712101634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e81ca9479fc9ad9892faa23d4a77cca62e81aa1264965982e338c673179cc6. 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/TWU712101727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b911b7a9934f8742d223832abdd2b4bf31527533bb13a82a5e6d1fd8578bd6c. 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/TWU712102469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd143773a468d02f0e9de037b0614e219ac4f68700356359ad9aa39b7667d55. 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/TWU712102471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1534fc38b6bb1d9a64623917d866d26b5084578864e94de09e719d1bbd88504e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TW1751208102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec62ae9599f9df6d8da577f03016f9db200341a0a75122bbbfb3b2524a0d629. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TW1751208104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef63eb2b2ae643456fd52e5d04668bc74bca91b2fedc55d04c386f0f61ba66bf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWA539116501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5466afb38797f0b7e799aed722b7a01815844b460941403a9c0e053c62fbc0dc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TWA539118206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a73784e95477216121a5b79dc72a8a22d4b1a6b762bc6a21459fe87574af2c6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TWA539118201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef63eb2b2ae643456fd52e5d04668bc74bca91b2fedc55d04c386f0f61ba66bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWA539116501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744448ea2656569bd8e07c9deea3a8553ab74be8109291d592ce0dfe58871b8b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWA539411101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a55be8334b24ccd8b678e77705954420f8d34f805b21d2f6db1d72caeb522b2. 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/TWA539411102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d90e09f40afdf1ef7635e7eba6a1abd3579ac6f88d9d843bfcdf981aabca3fd. 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/TWA539411103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9592d5e35b445e5bc6d68095525db0d5bdb17e3c3ab9bcc88fbfbb23058377c. 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/TWA539411104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5280349ca58ac3b64243e7d0c1441b494186a8cb55e341dd8906b3e6aed13c. 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/TWA539411105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb02e6443d5f89d159cb5e0c455b41e723e25e9a71b9135ec8059ae724a4afc. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TWA539411106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8e20198a828d4b928249d6c634954358bff90480582fc9f0ff737f737f5705. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/TWA539411107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7750eb39b213f286573d9884384820943160e967def02bce27a04bd13d5b1bcc. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWA539411108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2215e20b321726e08d96fb6b3070abe2c1e9646f6e0b58bd53c90d452b52fad0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TWA539411109.