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 0x76014651c5ca2f67c9661baba239f385800a6567d44a19079587d9ac27027991. 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/ee8055fe-89d6-42e9-8ff3-891bfe75a0c0.json and https://artists.proofprofile.net/proofs/artist/ee8055fe-89d6-42e9-8ff3-891bfe75a0c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Prodigal Daughter - A Story of Homecoming
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 0xdc9ee639ce9d47ea34ead794f35590965051aaa96cb6cd83b8849434da560c04. 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/NLDA61600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f6e205af1dca57cf22d3a0abf04e0b4a087fb263ea1076db51a5357428ba9e. 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/NLDA61600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0134d602d4a1f16c40e8f41f0b449740c7e3bfa92b1981f944de274478367b22. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NLDA61600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce7603edd0785f9c3b4d033a8b84eaf5bd662e8e667f96641044f050f700432. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/NLDA61700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4615db2a70cb4912d1e32fa64bd3a5807067d0ff5cbbbaaf9f3b25f7ac9cef5. 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/NLDA61400002.
Verloren En Gevonden - Een Verhaal over Thuiskomen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ae13632f999b3d317bfcb03b2d7a6b9e3c1831b7ee8a32a7312e5c8e9401ba. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLDA61900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d28801d3bb4703127de30a9764ea011a53d72aa258b2fcde10b81ba57ccc76d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLDA61900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfff8cafa38b6c9c88d880a66945b88333389865814c981d1d8ae4fb89754b6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAGQ2270770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab4f3a0fd4878fca93d4eaced7b5fd18e16c574706f9b4949959477fcf99dbe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLDA62300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6883eb793db1694dac52904df394872f5babf4a001051dd031bb54f1a0098e. 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/TCAHK2312407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc940945416116bce80fc3a89bfeb7875a36551c568149548a28c5cf392a5356e. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCAHU2414955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83eb72d99a2f9fbb9a9dd0f6c92aee95610d1b2c4203d847e2a3796070054a69. 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/NLDA62400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9492e9da7a4740970ea469aa2ae964d6f725ad0511f44b76fca372bb114c20a7. 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/NLDA62400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8d5203e77821d1ffe4266152d97a0a78919a7d287d9cf47dba8661890b14c9. 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/NLDA62400005.