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 0x2162abc7ed8425a3fdf2188d6adab6a95f088bf4df361df18a7d5c7312506515. 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/1d80373b-2261-43f4-b88f-8a71e2547dd8.json and https://artists.proofprofile.net/proofs/artist/1d80373b-2261-43f4-b88f-8a71e2547dd8.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 0x635dbd7341813edb8c78c6e5818cf7359f5990bd8e086ff214a933f5e7362d01. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR7GQ2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35818e1978120b1e7d4e84f0e388bd8575dbedbf4494a7eab5bbc8c9306cf2ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR7GQ2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df7e77251a5704d2403a9bf53a8a2734969f1d8dafcfe397943068d0a2fc2f9. 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/BR7GQ2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba397b4ef88e05e8869c2729396f3aafe0cc40afa5c4e0d3a7294843ce879b5c. 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/BR7GQ2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae6f149e10f5c8eaf1b965c5f77c3593d47d4e8db18bfe32f3f632aece0ace6. 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/BR7GQ2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf94e4af9769ca25b6857bd5cf0d158357a446b8aa20f32bcad4c0f3638b0832. 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/BR7GQ2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0b22950c8a13abcaf64e14ca9a35c95d1ea338897d1ea93d824c387d3df097. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR7GQ2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10777eb893a287cbe45eae115dc48e93ba23f249e3f58a0ff78a6ac82b2db1f1. 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/BR7GQ2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ee943aa4d783fd33f7b0eb4cb473c268740d5e7ad4ba354c3c0659accd9abd. 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/BR7GQ2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3137a7fe8e0be58807c36dab8e90ed62ef3e520a6ddacadea03150f95bbaa04. 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/BR7GQ2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddf9841bbd6874f7c9de3d300bc374fc68afb43c5a438825356a111400447c1. 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/BR7GQ2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962c58cbde02a428a2b39b6121502bda0a0672fedb12df0f3f6504ea6e88965f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR7GQ2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d9cabd3f6ed995acab80c5351df8ce6d3177e9c7172fed0e5df4f1c49f3db2. 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/BR7GQ2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c930ef8dacd768c3ed2d50dcce63655be15650cb0dc2cfa8244a7c4e62917ce. 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/BR7GQ2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f63c124e60193aab75a12d0a35069691b831e1a2357014608a6e34f1700d280. 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/BR7GQ2400013.