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 0xfd1e7bf6c61189744a5edc22e2e604085d9a9820853af5ce6b7722b89c2b0323. 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/c3e9a99f-bc2c-4df0-8b3c-714fd7dde4fd.json and https://artists.proofprofile.net/proofs/artist/c3e9a99f-bc2c-4df0-8b3c-714fd7dde4fd.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 0xfddef4cf0ca43c6ca3c4c12e1998c5bac81792f43646d82328c05873995bdfbd. 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/CAI250304101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59522a68f0adadd970a83bfa56234d2791f2bd3b089699d63c936fccba6fee98. 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/CAI250304102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4f75bf852a6f406bfd38a524ff70deefe915b036f6929397106060c1673a44. 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/CAI250304103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc70e0cd37227b0a1d69782c318346e899ce095a2b75eb4781c7b4711478b303. 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/CAI250304104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2236916d364edc29f63cc5b84e46c36688eb081231adee6c8f9636575609b1fb. 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/CAI250304105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1470672be19a318b2e6b5e1076bff76f49c9f741158e2d2918d48e83a16eec. 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/CAI250304106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b2cf7de4d572cf641793232d096a65c525411e5304997b87bca19731cf3766. 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/CAI250304107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e6f2891df402a43758a50e6a56ea4334f4641c4ce1bfb91e8aa02b9fbf7476. 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/CAI250304108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53890d18f321c044ff023bd6d05693bb605f2cdc800e0cf371155b159b55d85a. 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/CAI250304109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dff0727285ed5a2a31dce7ee4b9824f811a8c4647b773c9086f0fbf8bb801f9. 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/CAI250304110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ffa5c3c6eb38fded2bacb32c076b27d9bb727ef1e26ff01e6412ed86f9cd53. 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/CAI250304111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f75aa0f3e1a4e7f8cc7ef95dfefae0b785ac1ef294076514aba25366aae985. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CAI250304112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2db1edc9b6f75e009dd2f4ee65aaf5c5b240431c6258fbeecda657a777a3cf. 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/CAE561713006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d81de04d417346bb15195a0529e9bd00cbba4c3e331a5562a02a6f2e11da85c. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/CAE562125713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38429f79f415a33a3822cf8c8c4673be3a907c8d9c154c1c2b57995eb9209789. 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/CAE561916310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981e59a9ec69e63ca9e2a3ae016d8a94963f7c42af010a9cc590988746ef536b. 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/CAE561814209.