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 0x953770d71e0a1787a07d59b918e1f3ae59e0eb479a6f2766af0fef809265ace0. 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/b569114c-a6b6-4818-b74d-b13f300b2a10.json and https://artists.proofprofile.net/proofs/artist/b569114c-a6b6-4818-b74d-b13f300b2a10.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 0x51e87fee32c77916f3275a6bb22b2f2504e88dd7aab756c2a3eca4ab4acd6c3e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLR901800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326f92e7afd53915614973fb6c3a7bd82cd216d9f94375a8c595b2752df1edf2. 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/PLR901800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc9353d06706e58f378ea881529d2336d0c44d92223ac98a4abb923806cbf08. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/PLR902200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41906b5d8e843a6db2437078ecec6c73bfa65052c3f2aa4bf0b284c7b9bac331. 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/PLF242412107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41906b5d8e843a6db2437078ecec6c73bfa65052c3f2aa4bf0b284c7b9bac331. 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/PLF242412107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0610aa5c81baf45cb73deb371f9b92c03f4b39e93fcc0740434fd4d6dbed489d. 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/PLF242210211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7800b1153a364fb37e63856106a6d0fe9fca6b34f0d1a7a35aa9c61a33623b. 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/PLF242211094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44179ecec3e62373b5931b0296d8a2b49cd7e660694cdb47715d299b35fcbeee. 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/PLF242211102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc21aba956bf4f6dec95257d00de3f5e4045e58345289fe2ef9fab6ca45597b3. 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/PLF242211103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6180195b180e1ae65ba88539d849985c52eb983133910b35e82868be22288139. 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/QZES82193240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2fdac0a6214c93adc9e38514e54c336a55a47b4bbf75e7439c0f1372d8153c. 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/PLC062413581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7929a2de71e8da1387a880958f6b015d5829e32af899f028a9175aba33d922d. 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/PLC062413590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f15b867951bb1882d3425d031ede3a9a71e1d3e3c7dd6fe07e20a6f257d700. 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/PLC062413591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006b9c1b19c65761eb7d647e8de27fa25a711ffc8dd8366a7bb43a350a311c43. 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/PLC062413592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec54d4c17c73f2dc75eef618ef0dc5d6add996f03fc4051d052175cc8b4f7b8. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/PLC062413622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47889afc0eb362061e1408f78fd642d2c77c2fd442e375bc4983dda973d3e5f8. 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/PLC062413624.