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 0xd4499c4764e571defa99ad083339c4080c610691d1097210e3944cbfd47cd8fb. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc5e46ba-8ca3-4bcd-b71f-b29a5083eb78.json and https://artists.proofprofile.net/proofs/artist/dc5e46ba-8ca3-4bcd-b71f-b29a5083eb78.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 0x0bbe1ec839bf86b9c82186add84163de22f9126afecee4809b0105f7e9f6a980. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/BK3112500060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fd0cb8d1ffc51dee3f56df34e81b126585d904e0acd32e350c0287749acf79. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/BK3112500061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dd1d0032f60b819976a52c63cad0c7b2091b52c2204ab52b8457143d23bcd2. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/BK3112500062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122ba9a705bb3071b3da83dbfeb1a855d1c4ac65a5f0b3f296c300894cebcd17. 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/BK3112500092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bc55e7545ba4080f4b089030528f88dff192a184789126c681b0a806057fe0. 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/BK3112500156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a5d23517eed8cd57a11772b630258eca648288ed454faff8c85c78ff537acd. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/BK3112500175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb9e2a88f58809256824503311e74898af89e675a58d4dca3dca7b4473e458a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/BKV4M2500114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699fea970ad4290c85bfa8fe51821d3f14e99a72e8a68aef6739c3599a5b94a7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BK3112500236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f25d2c597685bc056a3c65f2db024a368b8787bd800d8757771afafe8a4f31e. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/BKV4M2500136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f492b5cc76489c99c93d8d27409caad9860c97e519f7f59f988929588c1249. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/BX4IU2516310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd9a06e7e0c3b6d3559eeb3dc8babc987f28aa0fbf91669d35de9a0db16ffa4. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/BX4IU2518813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d23c948f4aea695c1d60b756672be29e2272ec6d58311d2390af273864bdfbd. 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/BX4IU2520439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd83c1a511e727922d4ace9ec88257d4e6fe940bc3063bd887c139af2bfc49d. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/BX4IU2522288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26857a71738cc38d5b2e97ef1adfbccd2922a6317fc97b6d86a3afd73a2d9e91. 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/BX4IU2522190.