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 0x00b3bf7d8ad052abfe84b2953007402d9b821ba8b49f340bd9b858271465ae01. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ad4fa18-a9e9-427d-ab3a-c3dde0df3df2.json and https://artists.proofprofile.net/proofs/artist/6ad4fa18-a9e9-427d-ab3a-c3dde0df3df2.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 0x1782172deb18a1d788f40a294fe6fe5f8095354b5d36ce4a227c4c7830651ae7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKZGC2502817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5e558efb2ebbda9942c7e3e746cb7a07ee58db1092ca10df05389c47c540bf. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/UKZGC2502818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44832a8c5853fc62ed99d57e3822aab30029049e324e95cf2e4d085082e6ba70. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKZGC2411237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1545d0a0729f83c7c29c89b4e4b72b173a0ca18f75848678a0f6f6a14c317487. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKZGC2502819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb814283fd2e6454611b1e791d1ce7e586016fecf4c37a5f2024fcee8a2a8e3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/UKZGC2502821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee515f1f267ad7d921de4ca71ce4682cabf023fb84198f8e8fe9c89244cbb37d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/UKZGC2502822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61e3a4c6e15a7e990ab1bb0fdfd3cf14f5e64172a200fe0951fc640059e8188. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKZGC2500911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc654394369cc41cdb848522c7b86b4acf09a0dccf25a306ac00b8bca833756. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/UKZGC2502823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594353297700caae7a5babd3095e527069fc3a368f7516f326718fccb157d360. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKZGC2502824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0f0441332446fd52941116792b2a544c26335fb525a538f37244354135a799. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/UKZGC2502825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f78de6159e1bb8a41f6202d533cfbacf7f0734ccc472d3c1c0a15763ae324e6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKZGC2411218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59c5c28c8bbbeae2367857060635e7d33a6e3c33252edbbb9861eeac4cfd5c1. 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/UKZGC2502826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e8adb3d9b21fefaef9b4defb49b557be82626df0d9a4709f433e19e0e74d5c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/UKZGC2502827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27c66b094ccc3e1c9a69fccc1c0be11abab91ee4a3ca86288996ce7b6bbb8a5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/UKZGC2502828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ed69da5b2058298f2d848ea83be76726528be2514cfd01bad53c290bfd53b3. 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/UKZGC2401974.