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 0x5a6eb12771c9ff5e9ff123be0e35ee8be0286970c2de9ba37ae5195cf781e060. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c77b74e5-99a2-4d7c-817f-185ad33a5bd1.json and https://artists.proofprofile.net/proofs/artist/c77b74e5-99a2-4d7c-817f-185ad33a5bd1.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 0xb3a65b570176ebd8af6aa30113944ee21d7135aa195d59f93d30a48b4ee77324. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ITK2X1800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb72dc4316ae8f6329ab42364449c526fc4a4f60492af03cc0e6d4270c13aa9. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ITK2X1800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bb15d3ca3e18e0a2a435c3b04fa60b54670009ce6eb4d03afbbfeceafc38a8. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/ITK2X1800113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe985bdcc05aefa6d6d8e9ff7566867181030b05fab8b2abe9a889d09e1073d34. 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/ITK2X1800114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70ee46916fa32a5806457945c4ae5e25fc14de3ce940f5d9cf6e1fc5d24eea2. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ITK2X1800115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929359eef9268b3b0d4e6c4e32c7f994f57da14edd06b902aeb01aadbe5798cf. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ITK2X1800116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87532d40a1fef7cbdda1a56e51ef81d6fbc031a2bc666552605805caf6ba668b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ITK2X1800117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc643ab13a16ff18daf5c349f0cc9bbeb9aa99668e8baf3d9877cb046a64b3a4a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ITK2X1800118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc1bd149374b081709aac38616d948e4a2c3513473b0ec5e0b8a1bebbce178f. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/ITK2X2000243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716cebe2ab7afce25c60d7527d163a3463588aa827d1ce1fd6bd2b3a62b57b55. 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/ITK2X2000244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9924e3a5848d4fad120652c1209e62ef9dc81ffe070b18699d2d946b9f9e11db. 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/ITK2X2000246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd007dac45206ad5fa4bd1b3457a7bbaf9f1124e045ae68ff5a24951f2207594. 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/ITK2X2000247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e99751514870825a0d909fada6c55931c389372babf2d65ecc2a0638f2a3d0. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ITK2X2000248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112064f2e683925c779b73d07b807a34e444025c917138968159cb8729546c52. 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/ITK2X2000249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bff3103ecd1411dd425d0bc0f1e453589414e60574cf09f16cd1a0c006b75b. 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/ITK2X2000250.