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 0xd8e360988f4b70fa85bb07a8260fb2eb3d28e516690025371e35270de51fbdef. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5eb4982a-a8d8-4654-8738-a5646022b9cd.json and https://artists.proofprofile.net/proofs/artist/5eb4982a-a8d8-4654-8738-a5646022b9cd.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 0xe4b7c7663184a96bb76d1311d9a12790ddc5de3fbfcbd44edcdd004d5143b409. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMFMF2533166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e90fcc63d8a9318791286c4a6d18a11a06c925e5db2e0121b8d868b511442a3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFMF2533167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc491e856f8d132c26c0ae20ef9f74a377416c9d8535c29bcb16f0bd7132672e7. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QMFMF2533168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87410e982d52721d723810fb7d79d5a5c660b4652edd5aa978a82bd592086a7a. 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/QMFMF2533169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429d63e6e4e33d22dcc7cf68e1288df29bf9355143d13986318e1bd1f1facd66. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFMF2533170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7b48f5db122d669e5c071ec44857e882bb79e8985775a97a8cf7e46aeaf2ee. 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/QMFMF2533171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3d7928f572665ebf6bb457a0b0fbe12d35eeac0a7bf27cfeaad94c2a8c8d0e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QMFMF2533172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9920aa2beea741b66f4e8b5a3494c336ccc9b38982ae0a3b17cc65e53b65facf. 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/QMFMF2533173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fb58c8298feea210d3f1ac634b33d626a099a3e48c862bf15bbfe23d821ae8. 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/QMFMF2533174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ee9c5a292573f7f01f20ae5121172a2db1875d63a1fa82dc9c69a71370b5b8. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFMF2533175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd041bfcf9a0fad685c2ee69f2c28caebfa5b0f6709982129a46e17a56212eb. 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/QMFMF2533176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d73500b2f68f4fff04c1b93a3a36d0b311f09cc6219e7c072f1e22b66f1c06. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMFMF2533177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcaadb3c553d3f82d1bad57d1ee98ede5e0404a074b770ab95483097a8acfc7. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QMFMF2533178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98506b32bfda1c5525d41e094375adca7ca0257e22b2082241fc406b3e8d522. 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/QMFMF2533179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9dfd0820445026efca6c415ab64f000a55f293f8b35c6f17d93ecb85d53399. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFMF2533180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a444f2b69cdeb9075d13cf570e48fbc07529bb9555f4ff9c6ceded7bd591c70. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFMF2533181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177d38486a67b37e95347a6b1dfc781ecdf8dd40243d2a0051a9734ad91bd75c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMFMF2533182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b578c51d651918ae01a6675fac10b792dc67f1d33ac9d3b141684528ffdb5b. 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/QMFMF2533183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67197a15231ce9600c5be5e00d005ec68528aea644080e9805c697611bd90d5f. 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/QMFMF2533184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e87c9691b923afa765e048e08a6a8003f3140e3caf2b9ba0172710c4c2a3141. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMFMF2533185.