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 0xf56983c0d5b7857503c929b4bc9dfb841e0c95297bad1e9379ead3af6ae3bb15. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9c8f28b-f123-426c-9faa-a8d85e5084e0.json and https://artists.proofprofile.net/proofs/artist/a9c8f28b-f123-426c-9faa-a8d85e5084e0.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 0x3dc486819b3f2adf364176472014dac543f8aa768b1088aa869f87b3e976c7de. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HKG731685361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf709537152c6a67c3ec2699cbaec1c7c4bf9cc036416d09e2766f0702bee706b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZZ972339322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af31f487e369c60b1b2852d22382b04568554e43f7f65d853aba08421e7e3f0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKG732310241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc6e9d68133bc9f88aeadf6e0e9f9b7447e6380c725bd66fb581c9daed34199. 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/HKG732319525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea724d79ba3f1fb6ebc5d2570950852d1d299234c169816cb6c5db8ac5d6e1e4. 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/HKG732276217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc25e5238a4cbdcca085543fcca10ab8a379a21aa077ce73aabffb2439d104e9. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HKG731793477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4041900356b668014632fa50c2af9b3020f60e520078c73634bfb4584db46e1. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732120206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61d390d2e09d224651141ad16509593a4590eba73512dc8282bb5892bcf8e0e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732131527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b79209e16ff2f47d40c2afdd3c45ea8b1fefffcfa60af711ee2548b585ed0c. 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/HKG732041046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d91a4e4bdf8e804c8ee6fca24b4ec9164bef0dbec6a85e2788a46ee0aa907f. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR26V2070130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49c472f058cdb43758937573e97943301ceb6f7db6eb83005e82e7912c11f29. 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/HKG732028335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93bc3ec6712a90a7d237bc0b00ba5cc6b7d930ac3405faee633f1270c5d02d4. 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/HKG732012813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc8f045c6c1590ac0295944e1b7908c6aa59fc7289a2abd27ad36e3982decb5. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/HKG732012897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1055f601a9ac79f0daf8aed2d40cd6c5324abbb4b362e16b8ed98f16f320b3ad. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKG732011211.