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 0x67b74652acbe70d556baba9676cab0b6c149ec4f5982d6dae1fd8832d0c37cc1. 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/78139fdb-43c1-41b7-b7bc-193b169fd4f9.json and https://artists.proofprofile.net/proofs/artist/78139fdb-43c1-41b7-b7bc-193b169fd4f9.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 0x98e2a17654323683da11075c4f28afdcad248feaa48f7d22b0fc5886cbeb680a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCJPU2337528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5271f1776607ccaa676b5f2621086a41da722bab35c53963805bed02666440ac. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:10:19Z), 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/TCJPU2337533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f52f060073321282caff0aead489eb3c575f628ec94b02d63af7a0184558a9. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/TCJPU2337534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b57dde987f65d8e594f9ce1e604efe2278453baa262ac9d71460728a218bf6. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/TCJPU2337536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34da0a6dd9f0be58f740c6c2d56fb8f65efa567c357735057ea25fed57aafb09. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/TCJPU2337537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e80abe6dbc9a51b767f0a2ec8a2f8ceadfc219da17c2ed5e6921533870ea4d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:18:38Z), 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/TCJPZ2448626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94791e6a4d9faedef560a872d560eafed4eefb3eceb53f4b28aeb622f5b4b971. 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/TCJPZ2448635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3dbc9e9353688a3ba1adf0e44a03b74652ce3ba869d63be689c32b34be5689. 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/TCJPC2421361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0b21bfc8a6f4fd5e3c4643392a0bb740ae3f3262ccd5d151bf2fa99fa729b4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCJPC2421341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c1002099356cab368c01a717f748ee8ba621000327e0549682e6b6cc5246dd. 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/TCJPC2421347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37437e94ae6e0010600168d988e7a2972cd5c5cb0c44070c4f3fb34895e12d7f. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/TCJPC2421352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1997faebed978112e2ddb3c118420a24596d75313c82a6456367723ca5b7b7dd. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCJPC2421354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52147b4a88f5a51f297bf0c00bf37fb925968a16b8cb40a9f8a121dbf085670. 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/TCJPC2421357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885df91eb6259ab4bf0c52353653dae78d73573652fefa41c95cb3ba1468da0f. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCJPC2421359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90246c885d14d3f425c593e995d52fee07e9401485dd2aa6200a3ad0c9784fdd. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QT66J2501664.