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 0x6723044b2017e68d68778545103b014feae2b279b5a62dbf9948c923c2563bb6. 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/2e866344-6b76-4b78-81d1-2fc47b1e292d.json and https://artists.proofprofile.net/proofs/artist/2e866344-6b76-4b78-81d1-2fc47b1e292d.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 0xab900c85af9bcc3dedc41f43d000c7d691fc0d73c74e83b91a5ca8d6e347a44a. 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/GBMA21865400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ead297d1a6e9870c30f9aeec3c1bd551ba4ffc9c1c4e72b22de2006b6006cb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBMA21865401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c38e03200b8162c7eafedec533ed69e3a78099c834b45cfff3a7de035094c8. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZ7R41750876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a690d66a39316b3efe028a4ddf4d89fef474f7bd6bd7f9b36f00873034de93. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5AB1701597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe009e0fb9e939e2b5aedcc38179d633a2dfba56ff32129b25a5a3b2a1598fcf9. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZ5AB1701599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22544b04238cded144e33ff9e7d71f8171aba149a68d7100c19ec690637dc699. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZ5AB1701603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8b4722059928c8fe99b46c5ecc9da388bab24c81cb979a881a7f9deb3b58a8. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZ7R41750859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7fbd1be402463291654d024ebf99c6e2e5a3ec9f474bf43162497199bbe713. 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/QZ7R41750862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba55c602b37f9c0eb8fecc6b86088962f68eac2c96a5747bd8cc129b2d61903. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZ7R41750865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47f8f0f5f9de8038838431db037389931dcd37d151adea36dfdb3d18c398a1e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZ7R41750866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd60664a78e3b2e191be010d107be3a3dfd3c8dadc4988d92bf2155855c91015. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZ7R41750867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12df8022aa68dc19cc570d25297890e7f65bda849b5c7ee90a7c3d607192f15d. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZ7R41750868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa277ecfeefe6ad24f26f944557dd6523955c3703516143de4c639dc7957ea8c4. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZ7R41750869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed5ec8adff71731d03e8028b2315c5488c20cb271c9a10431208bd2bd694ef9. 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/GBMA21857020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb763a48a2c1740b18cff0aae2adbca196d37f72b4d473e36de9fbf15e13dd0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZDA61989454.