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 0xd8577d7eeb62075dd34b679118c944ffcbd3fd782f506fe55354156ad92d8a10. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/787f2846-64e2-4193-8cbb-65b3974d9cb3.json and https://artists.proofprofile.net/proofs/artist/787f2846-64e2-4193-8cbb-65b3974d9cb3.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 0xc4b9e912484998a651d02468d3b14e960b328b49813a9387cf71dfb68309ef98. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US5UL1058533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c151285a19db986dfc5643bcb8415f550ecc8d7333fa9d5a789ea0514bf58f9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US5UL1143974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56df339f35dc70f32f277ded2df07e45354ac6a145ec59679828431e5b05ce3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBPS81500641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1fcb0fe2ed77bcbe82e9feeba61ad249777a499f645100f7bb8b3d0fca7aa2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA560947507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737c4e8ca67b722ecd2c5b4eaa659efc0db508f40fd2662eeb1cf413a87922c0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA560947514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1262f149d0f592647a1bcf3763d470241a8a72741ace14003880f441b3abdbc8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA560947517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987f91126c4804cd2cde7e029e6c8207ed4b8f2c920b30dc85b826582ee7c1ff. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA560947520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d76b7b86e8e5d6d57f29f0b4137a0d582f58ca0627521a8d316036b7ca78e14. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USA560947523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcfaf0ba1552b04b9a54547ca7437b8e0a2fccfb05dfd58d3ed1bea19c595d6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA560947526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde3a37ad28d3124865471add8c7f0a47948c90b8e216a9bb5ec7eb21b4f321c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA560947530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0915827fdc43c58ee904816113a66fbb03ea692cc2c2b1087b41c7e8467e402a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA560947535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6a26ae33c6396c8f0155a352f80cde3208f4fddc3f4431bf43a345c5de706d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA560947536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132c33f20c52f93610e0662a169189720fbb5566e06354ca0040c291d2fd355b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA560947538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203c6450abe87c36937f30fa467fc886ded222a1f8fe19b50f5ccd1cf06076f7. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USA560947544.
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