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 0xfd6cf245602de25bda6de3ff648847a6c0c160f76776f1826c490afbfe566b46. 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/e63527c4-b235-43fb-b9fe-4cb2f089218e.json and https://artists.proofprofile.net/proofs/artist/e63527c4-b235-43fb-b9fe-4cb2f089218e.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 0x0b26f2d8bdbcc197df4af2b1faf118b2a8134c2c078251ef2785f07e4940962f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TW2157034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774305d7292103ecdfd0814791d2cd3f63b21ec8e60e4f77a885bbb776970f60. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM4TX2190210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20e733d827e4fbb19996b9b2dea60098e6329cf1148cb7e25bd9ea2dab3b89a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QM4TW2239082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb6122be2a39f767013fdac7c6a0115cf8edb17835f691b4a0544723ae673db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TW2255528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20e733d827e4fbb19996b9b2dea60098e6329cf1148cb7e25bd9ea2dab3b89a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TW2239082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa8fdd5fe4780ba3d466d19ec961057883cf89dc36ea94eaffe22cbe4d71300. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM4TW2257831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa4c3fb59e010238c4ad81318f85d2bb2bbfec5504ffd4f18334dc1b2c0412b. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QM4TW2257835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c8ccdd0873c20bbc086ecf1a66ff5c86ab06f1dac2b146a124af251169b39e. 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/QMDA62230689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946eae4aa63177859404ac739a6161536b8b7ab1bf5a76646ce58fef631e3381. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QM4TW2319968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f922b5b6b49e5f37d25a04308047232589e794dacef83e2d572661eb9aa054d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QM4TX2538896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37bae0925e6d2d8a3ce064b21bcf20997fdddb611e309d030414b6c86d4dc67. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QM4TW2568344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb194ab50bffa3dadea7ccb7a8474944a39da654a18df1ad58aec95f955403ed. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QM4TX2538901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0084d5bed8336e3e63a42dd97421fbdbf732978d2d95d60a94b2f65861ce778. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QM4TX2538902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f3563e6c76f724a1354817a7285bd9ff8c168147fff763d27276b8cea35281. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QM4TX2538903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51f124b8babcf03662a01d869490bcbcb8438983e17d0c0cdc2686119fe2177. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UKS3T1900027.