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 0x09483c4e3b15aa414e3199643174af64a27a5be0581e51c178029673b1189e52. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f92b5402-458e-4275-af74-3c066d87c0cc.json and https://artists.proofprofile.net/proofs/artist/f92b5402-458e-4275-af74-3c066d87c0cc.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 0x77c4cdc18d3c0720145ccc34a09cb870a972ac349e87e5c688cc562239e5ca57. 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/TWA452313608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85423d16abd0e97a4c367fcc91a8df2313cd2a9e443c237752347f109318007f. 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/TWA452313615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0432ef3ee2fc35dc8ed69a4121a7152dc9f36c12cb03e9414248f18ff3ed66. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/TWDB52400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dc6fff7ea05f919e889e26106274d38c86006f99494fbd58026e59056d3d76. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWDB52400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77075d6ec760060c06de99ce7222378fdc7518cb740bc8fb8102c17e8fe2ca8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TWDB52400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994ea2df5c68be4b51996b317139f23562dc74102f4cda2464a805caf48fbcfe. 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/TWDB52400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bb0483b1ed1aa1bfc8cbbf26903c0c38205d409a7a14e0f0504fb8b57beb35. 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/TWDB52400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14cd0f1dc9c54fa6cf2657a1bbe46c2d55a238a7fccea4b94e01a12f66e2440. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TWDB52400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f0c89841851048f199111283f0073426cc0443478688ed9437fd74a4f9fdbd. 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/TWDB52400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6f96d76c63fbf66ce00ffd35a2641d1aae1ac1c6af2d343c1b293aac58e5be. 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/TWDB52000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ebd5766d6e4f1a54b6116559d335ed8f76e850b02f6e56e3b5158fc59e8e2a. 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/TWDB52000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3815f3355c8c998e69b2944a17f60254988483a22e05d4ee9a3adbbec84534c8. 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/TWDB52000033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77d19d8b7d7299f7b38b4df6ecd487696054a5495b11b3348483cd89cb50c18. 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/TWDB52000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa1498306e8320c6df77cd72422049b4dd8e3a404ce645241f3a7d96ba585fa. 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/TWDB52000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344c7ec15d835f095ac6b3ccbb50c3080bc6230ade523d3f66fc3071b4f8a160. 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/TWDB52000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7623ad82ffaad188eac20759682ecbda952d8a3343e1e069ac36a08555684390. 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/TWDB52000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c089a7ec78609bb540a4f3169e331fdfd97ce6d6afd25a41a9474946f07faba. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TWDB52000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ad0cd9357fdc0c69e61e3423e863bea66b020f41a88d22c2435690c05af7b0. 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/TWDB52000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1329fdf526915d7e6a8a56ac13b38ae519564eda7c63a1348e19dc68e7c17e57. 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/TWDB52000042.