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 0x209ab246f4111d0d8480442105e9802103e149abfaffc0cf36f299f2cba433f0. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ddd7b101-ebff-40f9-b645-59f1f06a98ca.json and https://artists.proofprofile.net/proofs/artist/ddd7b101-ebff-40f9-b645-59f1f06a98ca.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 0x8b779e18a291d7db3bd38766d70ef8cdf56098d2bc8635b7036c5452067639ba. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLCK42236230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3919a5baac7b1102817df2128ee3f01cf44c38df8d82021fa186cdabe9a9b6ca. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DGA072484114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7960495320adfe2a4ae404e5a91f3857386bd634cbef57a9db7a4ea066d6d63d. 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/DGA072484116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5e95fc8a39213e767803d09e9f02a85d966c8859b8980a91d0ccb39bbe86ee. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DGA072484117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d82bcd25c93af50899ca30ea070c3db3e3a2a2807a8ed89c1399d8da15756c0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DGA072484119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47f244386d747f1662be13e5df6920a4739ef49f800a7900d63253f696736f8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLCK42408338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa508ee41d8b189a758326850f430e07aa1d9397486a582ffac6b6d3b3189ecf9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK42408339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7350cc7246bf1edfe7e0ea5f6c2547189067831f3ff0fd67f9e393ce0ebc32f4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2113387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d874929797fad2ba27d2585c1b7bf1435a72bf0638f659a68a63f392ddf49dc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK42412829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8abcad5fa8f95d34a6f459b6c9741861393908f3cd4acf2a45f2b83693f3fc. 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/GBUNP2008802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fcdcdfa2bfcfd7150f40c0543acff8082703d19f6e99d537332918f9ad0e50. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NLCK42219361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f16f8f199e00d72843b2a4a83f1f8627745f839f248b94579b98ce93bbd5ba. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLCK42219364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6fc8561ac08b1c3cb61a7771191606716b93ad84632f3d1647945041a5ec9a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM42K1973178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0bf7568ecec65254ed14e61a0d9bc3eeeb6ca78e05895c8e250bd5e3ffcff95. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM42K1940871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e046292c83557c5e105a0c6b84e8df5b36801be267c471fee31a5fa72401073. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM42K1979617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022d2987c37450d5112029450b89ca71fd25f1c426f4b8a5de18ccd1a5716331. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK41085086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d538a497bf370f86edb3d0447160c26feb04fe61ffb5df19365f78b52acaea. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLCK41085087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de6250dc49019edd6b610013acc0149ade86b062dbf735f5af6b4c739ca280e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK41085089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c8838df3944ed9d9a88e9e759fc5037a24557d74af79c7859f5e3928204109. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLCK42229165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9eabdec54f60c7ed6355b206a2d5b7c75cda82bd4a307b8d345ae4ac4000126. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NLCK42229168.