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 0x91f076570b462baffea0b1bc9e2e652234d13f5108557e22b7e9fc4dc8b7445b. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0e2384b-0dbe-46b7-90fc-23307a2daef3.json and https://artists.proofprofile.net/proofs/artist/e0e2384b-0dbe-46b7-90fc-23307a2daef3.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 0xeeec557579d198af6fbcc822c813c80e67cd4072f7146c0f8228c3f7ed57a4f7. 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/USZPD0610053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc727798530b0d2416f5d37ad9fe84cf8b8c311e281b7fc6dbf0eafceb0e6ee7e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USZPD0610059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd31ef858ea87fdd0d818694700bd6ddcf659c5682d5794a4a122d9c72aaa7a. 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/USZPD0610062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe428a04645d0dbe8ee1ef7c8087ff26a2f8641bbf3abeec441129bd529d38481. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52360620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b368c65aa3c79459c7326996be81646a439a3ad21471217560c2a6ca9b421cb. 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/USZPD0610522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268b11a3b44e8c3fba2962b4ce759769212d4cd6b9390a14feb7e77e55944c9e. 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/USZPD0610523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014c5493f7328a31f1f75d868b7a000ac66bbd9f5aa2731e06e206ee9fb12594. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USZPD0610524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9320bb1d659e247852aabaefc7c387ea0579a7b81b9a322dc2eb2de6992ed476. 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/USZPD0610525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32abdb645d123dd75ccee66566b13cb02961ca55fa45c8745cd5572ba376184a. 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/USZPD0610526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d5f27772223b2ac97d844ce0b37bd37e2ae92b96f9cf433c4c0d17b49e31df. 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/USZPD0610527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03bb8eeb6d64c0b3c73397e22f2d690faf7b4579a197370c6d1d1dcf8374e7d8. 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/USZPD0610528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbbe2977cfc3f07d580ca1fbab5096be17a75dc159bc12f79119ada2531cde5. 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/USZPD0610529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2712daf6edd20ea4a44e4d9c9b79ef35840cefc0fd820de232c92070f1a1cbc. 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/USZPD0610530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8a05b2e7a92e912a1d053bd899a714e9fd81b3d0ea0bb0fbf4cba41c7ea215. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USZPD0610531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723b210b50e6192ef11e0280a49a988b933b98c15f83a90820a6ee5e680c57b1. 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/USZPD0610532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899d760c06707f451355b43a798d4e34f69971cf09fbc24d2b239d4d530e0ba9. 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/USZPD0610533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf084e3b321443d237b3dbeb38afb4fd4ae2cd0120727567bf0fe79e71b6399. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USZPD0610534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3736655b40daf3e96973b422ead52db77b02899de9de07c9be800d506b422868. 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/USZPD0610535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc61fc350e10424fa2df914bde0c2c12d847f03800d13447efdb82aefddad13. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USZPD0610536.