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 0xf7c7b95c1b715cba577d3d3163708a6b5b1273eba366e0964f747e657342232d. 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/1d773490-3e71-49f9-a309-76b60efc93d8.json and https://artists.proofprofile.net/proofs/artist/1d773490-3e71-49f9-a309-76b60efc93d8.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 0x219351a64f3ccb37262771cee0fcb37f6ef88340242ef26497d969084483bc9b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZES62365929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca2a141cc36d669ebcc8631076509e1a97c5adc4775f9143c0bd75eeb90f7e2. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZES62365930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3e9ecc199652ad844682a7445e418fbd7c5f501f602dd3f85b6da3f822114a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES62365932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b28f1a446df537584d3a8afc19e3051d32ba6aa144db4e654c671e024de2dc. 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/QZHN82313491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81010e1ebc338c8698c3170da8c15f52cbaf999e9bdfaaa21175facf55ed068. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMEN2342144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd781d89c34ea2aee27e5bf16dcb2c393f2ca311ecce144b27581880839a6253c. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QZNWY2318684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa2783b37abba4096eb90585218fe270f2041fe552965fd1f4f5e59da4c119f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFM2339299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9517c90874f8b4af63784cd5d5f71775ed16468552d9759fb766ae399f54fc. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZWFM2339300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa3f5fd8cbbb76e36f5ce5779d1ab2e2675986e10f20cbe0a694d912703ec19. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ42413171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313ffbfbb4404025f7be9629ec0c3f0386321d45b1376995c5c3d700e4788f0d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES72412805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e6d7ab9b5430d687aa91349ab12a433c560670b282f56b26e49169ef74e3d7. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZFZ42413172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e82afa2adf34d2f80ce4455de995be13bd713dd16b75e6daf3a327a8166476c. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZFZ42413174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc9853aff000afbf577319a2a3350c95f7598b32f0ae8ef204c2e67dc048fba. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHN52483984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f91364e8bf1053156c2b1066b9b0d3ec7da1973e147961aeeffa9ec5db0c26. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTBD2427406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1eca1c6133a23f3f15245d1213094d6ae83037244be751f7adab16a4071bee. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZZ7M2465264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99eddc693c70680f45537140ae918749bf2b73fc08206b05dd5e2d888f907000. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZZ7L2584598.