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 0xa437b9983b20ebef3df5c9f4bd10bc1ec31daea77e9a81dbf2f9a7f3dd79df98. 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/9143cef3-6ee5-4fee-89f8-35c343b2bb14.json and https://artists.proofprofile.net/proofs/artist/9143cef3-6ee5-4fee-89f8-35c343b2bb14.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 0xdbef3796dff473f7d0e747603151fdcc3a8c27b261269d4b6436f966037e8ce5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USZXT2250415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4208a352011a4d0fc1618ddd0b236b59559c4785487679c157939229e08aae. 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/SGB502322508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c6acf7539a38cb5f9f1e60ecf06b3122a35841bc4e687be7801269149693f7. 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/GX3Q92093659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775593e8288c4be5fd64f5433233f47290ae83f807a66c15af819af3cb3a0204. 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/GBX722100271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a3d3419a80bb74341f0a9a10b1610698093bdf89bd701dacf6ac4fb6427947. 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/GBX722100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41313216da14cd304cf0920890508ffc030d66a240f8bee2578d7c712dd02d26. 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/GBX722100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a3d3419a80bb74341f0a9a10b1610698093bdf89bd701dacf6ac4fb6427947. 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/GBX722100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41313216da14cd304cf0920890508ffc030d66a240f8bee2578d7c712dd02d26. 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/GBX722100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41313216da14cd304cf0920890508ffc030d66a240f8bee2578d7c712dd02d26. 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/GBX722100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e931235f4c7d66bb82a0189efba9a1552a7d90a4d7fa8f512d8db81532282c. 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/USA2P2045882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff36507474f2fe840e484e4adaed3ebfabc24a22c34f42deb6f4abe29562bd45. 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/USA2P2045881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b6ff529e787819308b3af8acf56ee4f92096cc9fd9122ca67395381472dc16. 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/ZZOPM2002790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc820bec79d9c50a8e32b008b6f265e913ed742bb6be5e1d19292398d88e065ee. 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/GBX721700186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a26a9dcfbcdf3211acc94f32d07b94d801e16c6cd83fc1de4bb06862c34dacb. 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/GBX721700026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772cae30a5d4b24731b76a0205a779ed1e1338655c7ef96d32b84509c155916d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBX721900197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3281ae1e1362d095e39808ff4361541e9ea05f02f07d28d230a07bdb840a1b5d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBX721800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230d34e0ab206f8b68da48bbba0ff54f2344465030f933007460d6f7a18cc47c. 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/TCAIU2470338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38be0adf95f7aacba1f48748033332bba598d785b147ecc810bfd1b740622810. 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/GBMA22087901.