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 0xd26d7009baccfdee4b6341b77af1d6b16d4f4d3cb7e8b64bb61e104eff70b693. 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/fa0964af-a777-4d10-bfad-62dc347d253a.json and https://artists.proofprofile.net/proofs/artist/fa0964af-a777-4d10-bfad-62dc347d253a.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 0xc910ac6c51df64cac21e65e45d755a061769f9d13f8ab4172c9a75b503a5d2a9. 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/DEHE82300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b823b56e52adcbed5f187166bb499b4dc6b8b0a60de4a4db7065e14a5f50841. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/DEHE82300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd6bf578cb5f400a01d5fa011c2cf876ab41700b5e0af1b661261aa392ed7f6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEHE82300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3313740207df07a7494752f230d8d1af3886d2e7dffa48df7c282b7b90608b24. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEHE82300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6406d23377c00a300828a1e8ac87b22a918ce12bc6c7e8fb7c7095c0526f2b. 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/DEHE82400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb843eaa9d490c5ac031755e5e4f4c501312be66eeb0eec5e7d73c26263385c4e. 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/DEHE82400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b2eac2b9a729300debb117d254d51430e4e37befa387208c004799f396895e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEHE82500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8e627d373d66e00e9285366c5194b71523b18a4484d69e076153512447b336. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DEHE82400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb843eaa9d490c5ac031755e5e4f4c501312be66eeb0eec5e7d73c26263385c4e. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/DEHE82400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6deb40a54b3ad370456d015942edeb1c729953690dcaf3a0b5ce31dd4511d8aa. 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/DEHE82400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106f14aeff2649bc1c527716b5a79ac39f672f336b6a005b744329a060ed6e18. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/DEHE82400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6406d23377c00a300828a1e8ac87b22a918ce12bc6c7e8fb7c7095c0526f2b. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/DEHE82400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd218ace35fb3b108351b19f24554c20612327c7c7a370315d69a7e5ee87352cc. 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/DEHE82500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecee03deba5d9bb23a7615b3d8ae55b182edf1eb285afa0d941b8693baab2ba. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/DEHE82500015.