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 0xdab42dba6dd68f4977751cb9439e628e322c35b45464d859316b376ffbbd777a. 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/27ba4c7b-36ca-4697-80cd-3ea51c5e8daf.json and https://artists.proofprofile.net/proofs/artist/27ba4c7b-36ca-4697-80cd-3ea51c5e8daf.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 0x58bf0df0c9bd9a03e332d326a03998d84eede908ad04b80160ac66fd54a5a5af. 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/US3DF2228822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf9a59daa598b1fbc378c4f9cec3f0fc46c2fc21059b21e7c1a1ae1c48551ed. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US3DF2228825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce42ac7ef076b86b5a4c25649c265ac01536e40f528a43161f82600c53b1089. 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/US3DF2228827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61f62d5ed3ae173db060cefab326206cac81cecbe99f9057fe7e21c4467bb4c. 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/US3DF2228832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10dd229a647859274bb86ed34e5d1107e3fe957e572d8ebd488ef23c2cf0a8a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/US3DF2228833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c6b6c74acf9ce9ea67b5c28d31738565454b34f9ad997ae89a28da1e67bc3d. 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/US3DF2228836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a602cccf3b13c6c54102da177f649e5224e5d8c458c85fcc3a1a9ff0943f1a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:33:33Z), 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/US3DF2228838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d850cffe4064e06379c87fefc85e23efad911d614868b536f2332b2b491ab3. 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/QZWFP2461196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d749c704312e3de744fa0106ea20691be2018a41678841be1280ecbc79ec8bb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFK2448671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f3c1348f13c7fc41f75ae8dc0341e4d9e9f76009fc8367e1f453b5221a142b. 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/QMANG2417248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab6b0f9324f2b95a2e80a812bab48f44153b11b3edf4f56dfb8068cecc9200a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMANG2449537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa102bc984b8b096d8b75242fedbe16bc00d72bc76b16c003a79d2d8929b8c2. 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/QM3DF2444833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156e49543b131c61f17fe9db3530546981861e5f8e58c7e7bb5b53001747f4cc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMANG2451422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43edd35a7683af408239c792c60b192aa9b00406e0f55ee23e72085d57755a0. 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/USANG2479323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31df02460df1baedf1096c2652c85fbc33c26ebb045c71c34f2af24b903d48a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM3DF2446634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8e7aafa3914004f68e85e5a5b42d9b320b0493310c3e133473e66c6408cf11. 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/USANG2402181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e06a9909696af35da5e7eeab88862720a0a55cf6acd589783b1f68e064d96dd. 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/QMANG2419947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0684e1f4c5717a1150a4392779399d4d30d65957a588e9c2bf996d07ae90e9ec. 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/QM3DF2451086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec5788fab2c6eb0739903de7963bb3d5ff96bc48eff6f2aaf8bd505c733bd55. 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/US3DF2467661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26234949316e4cfd3e607b8efb82943ea3c892e5a4403a0161795e6b6b3019e. 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/QMANG2297155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef3ab07ba77fb809dbe2dd0b473a12f230d1bfa19f3805c39ea083714229c7f. 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/QM3DF2289645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840541fc8183e4824527eb09f75393103b13d57fc9c3ecd1e091e0a6ed8b1ffc. 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/QM3DF2244208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a34339b13632bb9d80988ea77b1aab389fb856346bd7b53b8a3a2e2fbc995e0. 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/USANG2293612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07eaffc50ad52f33e716a327c968ce120b3467c28e2d165a074958c119f1537. 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/QM3DF2228318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61498e98908d9a05fe0850adbeb501196b279c0c226860b2aad58d8c57432f4b. 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/QM3DF2188177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2a66b5b312449599de7b5dd1ce93678214f4cfb6992a68ca1abc9c748e3da0. 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/QM3DF2184260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501fea8ec1bc272ca787639b96bdcf3d8f5ac3318d260ef1f0e13f9c272c00b2. 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/QM3DF2156256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae83c516fc809a790a9c59eddc06a909db6d2ff3d5640c98e266217d43eb25c. 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/US3DF2132406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5cfc8b6ff8761d9158aaf942915bb8df7f98c9205d45c6411c2f012187919d. 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/US3DF2111187.