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 0x0ccb94394b0c2631568af78ca672a1db8796605fbda897609422cb86dedfcd4d. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cff2e6f-376c-4f69-b065-2a48decb1cbe.json and https://artists.proofprofile.net/proofs/artist/4cff2e6f-376c-4f69-b065-2a48decb1cbe.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 0x47b9af364ca2e20a4dfebbf8dc01dee2003019307f116854449e3bee655d16de. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZES51879875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bfe090db655fadecb240c3160d71058dbc7f5c480785501e5b72b6bf056322. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTAZ2367285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f128abca0f631c23350b83a2235cc9df6a2f078971ec198dc081314be74d53. 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/QZDA52334026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af2cec90226f91f27247bd3060456e855f416e51f9fb0abbe50f77d4f3fc7ed. 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/IL1042105461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ab19b58d5802621688372353b2d754f23fb065074cb8b8ce0ab40a80f03600. 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/IL6191900853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ef1392eb06909c0ee11d4e4abedc1ef47d1e7d265bd1b485dc70c9a6c86cf. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/IL1042102341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9e85d9a35cca03d9a32147d8a802001959b19876bde483a0f3f610b00ab667. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/IL6191901389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7ab6079300d985779d340aac2a24921e5b42fa012291e27ce61e0d21b8c95a. 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/IL1042105606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196e75ecdf84f5027631a14c7be771d6e8856d4333b9018bfd344be7d8781da9. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/IL1042105607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd486cb0ffdf82ec9d0232d21a51891f3011a117ff8dd9fbea766e027939e2ca5. 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/IL1042105608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18238b2e26635098819fd9eb89167635f09cabde6897ce34744a8f862dfd13dc. 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/QM2PV1607790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94616351b18aca4280e763c6e338cb9b11a0d6baf2abefc0fcf0c387ac323f41. 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/QM2PV1607791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325d42a7e29c9f68f9635e758e9845a7cb4818506c64e443661760f824c482ec. 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/QM2PV1607792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8254a26caa7a1f71e49bf44ceb64ded7829a0013f2a7341979c4c557e38bd92a. 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/QM2PV1607793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1051bc28d3a6caedd42979862fa34315ef5f5a1db55d1938f56b8cbfe90c95c. 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/QM2PV1607794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca81023e5d524a91df550d9ab2dbb6aed75357a9055fac1658c245e46e23eda1. 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/QM2PV1607795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f3a27e9a3ef2a3e5aafc2a2a782ed551301bf973d7b52b1a770137bc947f9d. 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/QM2PV1607796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0f24b3377d8090f7d104c7946c35ebe57511dbc74d6348d655d224a6c77c32. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM2PV1607797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065e0747a7d4cdc3971d13d2138f977a9e9fb976fca6d41ae96db10ef8b3448e. 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/IL1042401491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ef1392eb06909c0ee11d4e4abedc1ef47d1e7d265bd1b485dc70c9a6c86cf. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/IL1042102341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ab19b58d5802621688372353b2d754f23fb065074cb8b8ce0ab40a80f03600. 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/IL6191900853.