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 0x896127441587bfa78695d0f459b0bab5e84eb5be0f97105ef65282154daba061. 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/2217087b-1c57-4de8-a51b-d7f003562182.json and https://artists.proofprofile.net/proofs/artist/2217087b-1c57-4de8-a51b-d7f003562182.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 0xd76efa2282a54d23acc59fe5c00b5b4d9ffc38e42ebf6cb844cdb21aff274ff8. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCADH1724805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800e9f0ff6f2b475a3bda487e9c038bae37716d2408e184df2c5c5378b91535b. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/TCADH1724876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7111d049bf50b85e3337a2bcba247abdbe1ca89d177664086e0fd3df35b945a9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCADH1724884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c98a8a3df16a6c4f3bd2984049c8e926a2120bfd7a00e32a4167b2183411a0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCADH1724909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb626094cd886462d312c4ba6dc9cc3ce0d72b76eceaf11df453d37270d677533. 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/QZFYX2087116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905f0972a0a53b6eccb6c7701a714347229b45948e745cc766743c110617257b. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/QZFYX2087117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab25c5cf233ac3afe2910615c2455981a2556eeb4b913028bd87ca6b18ce6c25. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZFYX2087118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8cd9a3134d745de1480058b6e43899039f31b03914607640d3619fed938fb8d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:23:34Z), 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/QZFYX2087121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c226f1e12587837ddf84f3801badd631c776b86baa3dd103b589d88d858f41. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZFYX2087122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d1b936b5e73160654c47019bc8907ee0fc7c57268014cc5d14b5fcd2e868ae. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:05:53Z), 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/QZZ7U2494206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b59e16b8d9ca26eb636eb70f558727ec17ccf62db9d4e0227752b30b6bcb66. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZZ7U2494207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81af9ddaeb55eb1cf606aff80a9a9b44d7ed9b8bd68d47e76093954f6e35ff2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:54:28Z), 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/QZZ7U2494208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3502cf650cd77085a997a190aba828524388a71722074e59bc778ceb535eec1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:57:50Z), 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/QZZ7U2494209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecaa05467e84505a69ad63187f4ac8b24090a4cd06e5ba9bc149f99ff6c33be2. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7U2494210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaec326adf2928791a92f5166726011f0e696f51a448cd120de27cdb3ba0c354. 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/QZZ7U2494214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c14adfa831154325a4ad210bee7b79f4ff77e154ce8938ec6f43c5e8ad0583. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ7U2494216.