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 0xaaecca2e01289e8d6f23bfac99d8f6b16761b7ff1e7c5bd8fac0959193d4ca1b. 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/07836bec-d221-4951-aea0-99552c026142.json and https://artists.proofprofile.net/proofs/artist/07836bec-d221-4951-aea0-99552c026142.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 0x82126397102ad0f0e109386e7607745f626b4f2b9c6fff4d6a1ae5ed60d49036. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/NOCMC2303020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeae513348a4925b64e86085292ee5c3ffe89dd23458260f6b03dbc5c7388b6b. 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/NOCMC2303030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb35f80a26daa9585d0864343593ed40820f90b67a0c0214ede4e38a2aafc9a. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/NOCMC2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ed01f28db16a8ce071726cb32253dc6f2f4e2060cfce1e3372c8627b5b4d47. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NOCMC2303060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a60bba9f845a707594b2ac1c3e53d5c7a2e730a99b54cce9bcf4937cc074537. 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/NOCMC2303090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9996cb6de7ed2151273a8fa6ba50717aad54680c0f325c52f144b27a0a9de7. 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/NOCMC2402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3096f85163fea6ca0a2c908f70730a2794d27687628637ef16017a8eb748a5f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOCMC2402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba6293d6bf5c86ed8535cc2cf321345fec3d4233ce318097c6780299bcd5916. 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/NOCMC2305010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf158bc6fe8a342de542a50a7078c27d967c8496d0fe2cbac4fac72665a568cce. 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/NOCMC2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7107bac4a14c81564622689b10137607e303a2387a2abf718cb7b24b440bc52a. 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/NOCMC2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba6293d6bf5c86ed8535cc2cf321345fec3d4233ce318097c6780299bcd5916. 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/NOCMC2305010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7107bac4a14c81564622689b10137607e303a2387a2abf718cb7b24b440bc52a. 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/NOCMC2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf158bc6fe8a342de542a50a7078c27d967c8496d0fe2cbac4fac72665a568cce. 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/NOCMC2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7741dcc86f4809aaa453a06a794f11f0726ec4883b95e0714f0b091fda46ac. 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/QM6N22487356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd311814119e3d97e846a00f604b5ee136c047dcda8aade3573436be1b7995b39. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6P42455531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c16d4c560fc58f28cd3ec384750c98f2cf6934437ff2e154198fc67a700ffa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NOCMC2406010.