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 0x33c79b975fe036624267586c583d482555234beb8e0ab3ebc8d45703faa16bbc. 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/2de43d03-c0de-4377-a1c6-3cb996d2f202.json and https://artists.proofprofile.net/proofs/artist/2de43d03-c0de-4377-a1c6-3cb996d2f202.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 0xc2f50ebea3559e887e27dd3a1e7f62261b5fe4f3b2b540d7a52116d6e88b51bc. 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/IT7D82400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18dc2be14d267a911c42dc81c81cace22b35efaf3b7e2ff775389b85f113e877. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/GX89G2369670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb509a82e053693b275d7f3ec16aba9e561fc448b03c58bbb9bd4b70dfc97db69. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GX89G2345301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe705e47f7590fa30ec9d1cfe45248066b1e120cf4dd8dddb3e4e8b149718eac0. 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/GX89G2338179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b5c43dae26f0e36d1313778e3aa71f491c10e13f7f59b42dc39401a97ce862. 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/GX89G2330620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944f8c08329eb392f7ce80cff69cad939d60cf09c48e4b86e3d9835fbf1ba901. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GX89G2320999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a1b16301e1cb3e6266079801f6dfb678fa860ce62836a690a890a88b6d2ae8. 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/GX89G2399227.
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.