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 0x8ed8d246b14b8a0a5670aa6252572016f612c99b764130485e4fe0e4e15528d6. 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/4bf8cb18-ce07-47ec-bdbd-c8ea8e724302.json and https://artists.proofprofile.net/proofs/artist/4bf8cb18-ce07-47ec-bdbd-c8ea8e724302.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 0x4756e697053682ecc61149d31c6893327bb1fbb0a8aa99e52b9b3a7885ce48ec. 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/BXKG22400088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b87291553a4e0dd34fe8839b806c069deaf3ac6416c98c1df67d6e1f8b9231. 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/BXKG22400250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3964e8678dfe0ddeb60da24f25b045fd0443973f0a1ece12639347c8edd01a. 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/BXKG22400249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c781c3b077557273321315d6e97d038a648706154157a7d40c8537ade70398. 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/BXKG22400828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3184031efa290f3f72aa3a3f18cdc8ae31e53038f4e1b1c532b55aa896bda440. 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/BXKG22400827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb684292339b892cd7ae267cdfb780ab566575b111ce66786e8e584107bed9e7. 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/BXKG22401545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065f5fb3e3550e69ce45d738585052bd536737cdb34c69de3f3756725c6b336c. 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/BXKG22401894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279af971aa2fdbab1bdc121f4f8938a18d6f5fa06f3a90e713374d07947170b6. 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/BXKG22401896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9122c2202f78950e42caeacf80bf759b28d94a9cfaeefeeadb814edee11734e9. 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/BXKG22401898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ee5f168818c1e89eeccd4f2c08a481cae9dafe53098e510a62d19bef3cd014. 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/BXKG22401899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75031b5babab5459fd52ba87e8293e79ad825336bdb9764f133a945b70555a1. 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/BXKG22401897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec1e5c7bfc0f6a1eaaa3749a6744d4759c5f95a66c45a1d77085595c20bbbeb. 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/BXKG22402520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1084d3fa66cd4e3b244a43229db2dc28abaf5ae4b49a859e77a10fe1d5d6cf3. 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/BXKG22402406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83de4f3c77892a20e67702fcb7a9c19aba3861b7d6fd7f52f1b6fc2dacc27035. 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/BXKG22402330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15e0458719068ab38aa51d4b6d193df64ca9c10768f680f763512c26b9c5122. 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/BXKG22402099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8778538c1ec4d8e2d97412995807b90f4a004cf2d9187f617a0e29f72322c67a. 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/BXKG22401995.