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 0x79dc033d7aefc2c64fb6a6186bd86448214dc3b7261224d27c81154d21bcd2a4. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f699e1a7-98e8-48aa-8066-972376e1bc19.json and https://artists.proofprofile.net/proofs/artist/f699e1a7-98e8-48aa-8066-972376e1bc19.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 0x0b16fcbd2a719fb715cc87a2a9700e0049389276e3505dca09eeafc27675a340. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/TCAIW2450530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6779eba1c9a7b1cb20b616824c7614f8672ddee2076b350f9398bcb854549d29. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAIW2450537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d33c6bdff07ee5d0b58feaa2cd3b1746b219ecd5c5017d9f734c3bec30ead81. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAIW2450523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4664c83a711972475d9caac890a938bf370b173c3e5c03a49bf11609b85c88a5. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/TCAIW2450546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335dc49184dbd3e2109ddddb1d9394f86cfc4356224f83d0fc54748105951ade. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAIW2450551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c7c1f3c1205c2097fd53b56a3536fca5bb9c46d702319f649a9b844c06296e. 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/TCAIW2450558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6b8f6e52f007dfacfbc9592ff883adc86192a534fd8d0d126b1ed70b1c2fea. 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/TCAIW2450561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4802b31ae9e93900c95c5540456159c7424e171b958403ffbffa808d6b17903a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAIW2450566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd2d6e8c93196eb40c24ffd4eef68e1c610444e1c88dd54cf077e6a0376dee8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAIW2450629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdb8c8356c41b5266cc47bb62c289a57af04e6debffbee251a5dcd6c8d60838. 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/TCAIW2450571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b02f5f2f877971ec34a9f0d813c44cebd11eaa9239c2b5039786ff6117457d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAIW2450587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb2d072d804981f874e02cc7c862213bd3e1908adbd2006ffcf21d7615ae4fc. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCAIW2450591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10ca10d0b50ec9823750a6e1ed19101a21840a656e88dccae15a807c9629858. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/TCAIW2450595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5630dd06ac53ac68b67c4cca2d8fb4ad8ff9a12df30e817482ee0413d1203a. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/TCAIW2450597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc612d3a0d0711f0ea1983225d2e4f226fc4a157f6f6a71dd9d2bd5435905b45c. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAIW2450601.