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 0x9a3e585c5d0ada6f261b7a99b1b99f8bc6e292845166eaf5df9ceaaa6b2c8081. 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/1385f470-c317-43d9-a8f3-e73fc730c919.json and https://artists.proofprofile.net/proofs/artist/1385f470-c317-43d9-a8f3-e73fc730c919.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 0x8d3eaee21f81b225810ba25f251e3f1dc0bb96969742e0de05e91f8ebc77263e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZNJV2430911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2d40f29b9f85f30f530966ce2d4d77088a674732db0dcecb137faa0febd204. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZNJX2356018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00c6b033607da5cbac36e114bd33e1f11c61f40c389497ee3d63ed137d77f44. 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/BCHFD2400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9018aeec525a16077d07b2f84c28a9ac743b928cfe404347a79be17ae6770d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCHFD2400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77224a7e5dfdf01c8ef96da3f7baabdc960c3e04484dba40c184bf966caa6cf. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BCHFD2400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89344cd1420052b3b7bd7e8d15aca9cf86b8142c3fe8656b88707dc2e7aebf9. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/BCHFD2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd48dc40b2e50b3a38d383891d68f353612e495d5d190e9637cce309bc814d0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/BCHFD2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf128d5645d7d9ae5ba8a74f9d33f00c025a1562fd763e73dbc12b7d3429e63. 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/BCD592300174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a824219eedfd0190a8cf4c9193936f8cbce1b096e86be9e4624b8bf60b01314. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCHFD2300238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dec9d79cfdfc5005304088b327d1989e7d1a58f91b997a33752e90b9425e214. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BCHFD2300219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f3591975fa4e0e88f82e230cfae8dfc48e104e23bce9cccbedddec49158546. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BCHFD2300202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9172c094ce7e8516fa6597af7c6cd4b9262977ed8de0b71d747f98b40365e1. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/BCHFD2300116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd061eefd960239849486d4e77ec9a016744aec1c5e7ab8a0454a5a113eba2ba5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNJV2351564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba07a0549e80340995b1d523d795bc7215a6d5a6d24d110376ac4f37b09d036. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZ5AB2315637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13215a5837777e073ddc58d4707920110c46d37ba8cd922e2ba05d64c409a7e9. 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/BCHFD2200184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1449c15fd4897187b1005bc2e3f6594e3cb8b01b709301ed7024b7331ebe8ec. 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/BCHFD2200169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217a5c5668703c983bda01f986692a78c4a308910bd04788b0df2b36b5276d96. 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/QZTVM2225938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d44390b20dbbc6b39580864b21234568cd33b585d377073b8a927f03b9a568. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BCNWM2100066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c755158525fae8ded1c28524cd956b3c85f94e92fdafe669b063ce1b0693c5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX8BG2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925eb3cfbd2b6e0213a2a24b0d7236ed225f9e5917f848ec555f907c2da6aff1. 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/QZNJX2048457.