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 0xb4f3ab3c2c9b75cd614eb6df875aac7c4089dab445c7ce052ad372a274df6a7f. 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/57e56624-8072-4cff-89a2-3a081536c932.json and https://artists.proofprofile.net/proofs/artist/57e56624-8072-4cff-89a2-3a081536c932.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 0x8b9297f0b583c1c6415fb8abbdaf2bd44c2347a3b071a6471e01a4af706a9132. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAEB1944297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac47c3db1710a0e136c4ae8914b43eb2421ba9f57616b86ed1b36c619ba534e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAEC1951013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ea499b5c7706f610f13eb5bf70000390cff5b1168936dba3b38d2448bc0cb0. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCAEJ1957332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516abe612843b81597e73b3a612ac97356d031915316a1102089b21cfd542af0. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCAET2015322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b7fd1a0e5b66c2c61f9c571f9e95683989bc563ae5bab7ed12ecafce514c7f. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCAFC2033967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc4dc1748154dbd608e16067e71fbe74396dedf6beae775095c2b2ab195ec63. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAFO2106084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9984c99c2b8709aa6f06d5891eb86e6cbd93ade8e988a17013e185f49878b46. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCAFO2178416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbe7443fc1d7c48fbe99e4624f5654d15729fed3f8f087ef52b3697730ca13b. 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/TCAFO2178434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb672d001d344f2dd3c6546df45a6085702d2babf1a3a050a6580ce85b2184aea. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAFO2178437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f070c0cb2e06f5f3927a1c15a3374db8054867f1d3e12ff604787ad6bab03f. 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/TCAHB2316331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1676d1d12e00a83ccd054e26ed0f2cc0dc05940cb5af64810e0b69d8893adb19. 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/TCAHG2360774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca73d364a434d3b7c9ea8362561601d9af3ec1920622c056669af3633854fbd. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAHO2324786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c291cf56cb1fdca7e5caed74a3c265dd995606c409c1074cf1699439082f56b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/BKSLB2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc4dc1748154dbd608e16067e71fbe74396dedf6beae775095c2b2ab195ec63. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAFO2106084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9297f0b583c1c6415fb8abbdaf2bd44c2347a3b071a6471e01a4af706a9132. 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/TCAEB1944297.