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 0x45cf9e7c2f292b0e39087f1ba7658ec72dc3744f41d69affe1f8751b825519aa. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f65ac18c-c56f-4b66-ac34-394927154412.json and https://artists.proofprofile.net/proofs/artist/f65ac18c-c56f-4b66-ac34-394927154412.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 0x772412ee10fb3070fca1d8e248b4c7547715f91ebe6b61d3ce2b848b31820430. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ITAA82400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0ef426e25c15f4066f971b7dfa85a06574e1f5469f8ffe245235688e801fa2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITAA82200028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684f6814e9c25d1e3ef3ffb84704ed39364a824e3a688b50556653e2e856b2ce. 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/ITAA82200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574169a4bfde76ced681138650d1b5aa07cd5143e725c23dc9f383c8da69787f. 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/ITAA82200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0819e9658e0bd2079695bb3657496135f3f55f28c3869f676fb48288b35669ec. 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/ITAA82200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecada8e8cee7431a502990b78820c2e06b9819af65e7efc0a6125ac754bab7d7. 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/ITAA82200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa405598993684db752897025a262a838752edde1a8c001b5828d4e8b11237e60. 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/ITAA82200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53036b5649cc7a3a305b414818d4e4922f2b0b35bdc2c48156bfc5f85dba7189. 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/ITAA82100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025f7c94432886e10eac31e65ce546a9bc72767e0092843b53f438f781aeca0e. 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/ITAA82100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5cfd0c8ddca34c34ac06d6077bdb97d029db6ea8e3bf274d963f910a7fb048. 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/ITAA82100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abba5a636a7c31117bdebe978a71317478b997e3ccc823cc1673ac92ca9f363. 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/ITVUL2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9a19ae2f4371f681bcc1c3038f3ec6369ee4f3712985d4c1f5c3abb7c742b4. 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/ITBL41100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d43bf73ff667a47996cb348e96ecfbe1e0fddcc37e6c2bd500b29f7ff85a760. 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/ZZOPM2223248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa102b0d62fda3b7e6dc826062be1f243a21490055f1e0bb5163d769e700679b0. 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/ZZOPM2223249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189689fcd8633fa1fd534d7498159e38a431fcf3663cee3d74289493b34f1485. 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/ZZOPM2223250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637296fa9b35bd24257febca04a625812dc06e0090b38cef4c42e98846db3d4a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ZZOPM2223252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0246bd37c471b23affe684fd82e4677034ff08bb99767f7546b2a9c5a63132e. 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/ZZOPM2224072.