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 0x18a9d3192d4a10f353d1f464b8a1cbc7bc4c4779587570a47f68dd753a72c29e. 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/b42ceae5-57c0-456e-a515-3fa89113a2bc.json and https://artists.proofprofile.net/proofs/artist/b42ceae5-57c0-456e-a515-3fa89113a2bc.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 0x033515ab0c1f5cc877502770ac806b257e82aa88eb92c57242317061660d9bda. 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/ATRB12000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76ce74e6a5ad1d6866c5ef14a6dfd5364b0cff85deae2465b10cdd530a34d04. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/ATRB12000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d79344cef93a303b8826ff9b92a70bb9cf2ca56508383f4ba73d78965ea94a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ATRB12000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4943815b1c0c970aa6efe8571e8f35d639826b81a7a79f24bb9563736384955a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ATRB12000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0400ebff355fd8fea0650bd51808ba5b074df9534c456abc5d5c6db4ca5586. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ATRB12000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033515ab0c1f5cc877502770ac806b257e82aa88eb92c57242317061660d9bda. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ATRB12000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d79344cef93a303b8826ff9b92a70bb9cf2ca56508383f4ba73d78965ea94a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ATRB12000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4943815b1c0c970aa6efe8571e8f35d639826b81a7a79f24bb9563736384955a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ATRB12000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1831bf68de70cced5002101fd0450fbff4f4ccba144e5b6a9bcb211658c8d725. 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/ATEW52200904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8024bf4160251ff54826e42a65e9f4f323e0d7695c6bbee55fc1729c625ddb. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ATEW52200908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2c710eaf6970bc36510be47e4a1b3d4bfca380971e6f510e299e212bc7fa4a. 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/ATEW52200902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57cec50e76ed2f451392d50b3c37d35f823f3f03da25963dcc6ea44c1b70701. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ATEW52200903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2be135da3117a02bab2cc6baa88d05ef8a64f14ca3776a106f5551befe0f81. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ATEW52200905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2efbc396ff90dc0880470f250f228196efdba6a75c1b70028af04d4bbe873d0. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/ATEW52200911.