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 0x89016d1db79ce34d1da4de3bc1fb000a042d60f6a901a0304bb127d2101e4749. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b752f4e2-6d87-46c3-8cbe-6117189b86f7.json and https://artists.proofprofile.net/proofs/artist/b752f4e2-6d87-46c3-8cbe-6117189b86f7.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 0x62dbd1135e57c43c9373074e0fb456b86c2a04f66fa2396e880b6aec4f7cd673. 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/QMUYR1300252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c70a260e674810816514cfbdfe9e1459bc14efba4685adab8efd5a38d5c47a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMUYR1300253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c0a4625e864f1aecf76e50c0064ec78a9b2d3eeb9f058e1be0cef941686ef4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMUYR1300254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c7b8fc62e945d9d2877f08ae722741a436db2eb3a839062ece81840b828d63. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QMUYR1300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7c267f5be156515dbdb8912d0c0cea31c1e428d5ed423aee30a489f0405b19. 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/QMUYR1300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77076cf4cbe3c4ce18e5d27ef94975894d4ba6df870070b7efde38b5924a10aa. 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/QMUYR1300257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1222b345c3d4d70d9fb9d59fa4812401317a856923d67ea40d546a7ddead1478. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMUYR1300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ba671c6788b0e1263908851af3dd722d6885a741a6d6e3fc97b40c8c805c1a. 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/QMUYR1300259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf063a90da400a8fa87bbad6b7e4e1b00e1197a9c7df957a8f5a18d7bb5b552. 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/QMUYR1300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0cd85bf9ad4a725204491ad0d2cc67589a372475b214873e29d167ffb94790. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMUYR1300261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7119e441d8bb8dde4eecb085f4075511f5a788fb8bd8be3e8a0be2de838b77. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMUYR1400329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80bf116ba9bdf69299fa6021ce83f48e7fe4bdd46b0f8f43780853c13262eee. 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/TCABO1381060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22409215af0a8cdbc6f2d6512da763f08ab1a55d8cb52f75c3cd3d16a1f65a0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCABM1313008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e07c815c7692f90344d62503cc759882904b4d6e8b1332ba537f213ad463da1. 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/QZZ7N2491991.