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 0xdb74306720d5de0c75e0af26c8a230076fc6dadedbb497a3545f6d680ec0f408. 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/16ee64a1-f85d-4416-8674-2001a4c7e2a3.json and https://artists.proofprofile.net/proofs/artist/16ee64a1-f85d-4416-8674-2001a4c7e2a3.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 0x008dcebc1b8112b591680c67f0e76619b078259c865b60ea3d9fc06402ad5cb2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM6P42476452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67de868766851b45c01626482f26db5311a3a95dda750b825ce585f2696bade2. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NL5MF2102706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe6ee1a02beb4fe62d9dbab80fa95af73fd8e09cb363857e6de0e0dd6a8bbdf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2401331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c0144942369fdb6d57ce07ddad3a2154b77d4741829c8aabc1e5a19f6beef7. 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/QZWDE2334224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebeb7be05f08259a733e49bab93eca9811ff8dd457f6bb399562ab9172b2c389. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL5MF2102104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1cb8362c82afd48eb2487d1143d63caf4b89c4d9e1324937ab17808176841c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLL8M2301218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbc87442331e9958e0e909a7a71e2b433eea434f4459f4c0a8350051c84b5e4. 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/NLAM42300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f603dc900fbd0a8c93924af75223a5c4bfd6f31d4b9aa8b430c4b5c497383e8. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ITHD42300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a1e9201d324f5bbc26b69110804b24153f1ee9c89618c3d65a723c1ede24f1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR8W02200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b42f1ca325dd9926469fdf23d5ae240ea5217302143d8893f1a70320d0a6ad1. 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/USA2P2237471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba490e6001fe6b96d88be2caf750bb5d865751217409014171ac2cf50664bc3. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/ITHD42200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa813f4e587674cae6f967d095136207016bca79aae2d4e224e66cf09cdd764. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLL8M2201260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664246d1f3ea75ed86c6b0cbe7ba8ec7d4f5000a806722295eb2ca07938af353. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2227401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29418a24c05bfb105e31b451b3114fad4acbcdc05cd3abca5a112130081ec834. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAU2137331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf5cd622c05e710b125f1f71513b4b4ce0f89d998a2b98bcaef70b28108013c. 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/QZNWU2135418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ded7f4e830c6a608784889fcff51060df430c3201e16bf794b51891af90e92. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/NLAM42100133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570da8cda8e6e1cbe3fc8c2dfe56ed96250bca046615e6158ffe4446b6d99ef9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLRD52018918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13c211c96db19e737f5d5b373f66046473113bfe8e423d9102e386ae0f92104. 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/NLAM42000259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd794338ffc294a723043b73b460ecddc3b0dd2d40f3dd65965a8547d7349da5f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLAM41900247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aed45c24c31cd39e49ea2d864bc1f8d9efbf839a6fd277b307a81816549806a. 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/NLAM41900144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4e66f36001475335b1b15c5b792c0d0ea1c43e01a16ea6283b5547ccbccf1f. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLAM41900143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93353529710c7ebf864e8674ff7aeac113223fe46e5277615b96a85ec31d1d96. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLV6R1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf4b0044ff616781ca801782754b22096e2a1584ce3c67eeb79472ef5fa9f9c. 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/NLAM41900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52880e1ff46034601611f7de49fed0772c0b4de8de668a04b82797bdcec08f5b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLAM41800082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b725e9aee04d77985bfe0c4ca0e20b2295b99d5006dca0a4abe209e858bf24e. 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/NLAM41800067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c66ce4a3c3694706211d71405c9c74022af98446409bbb4d82242924c0cfd1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLAM41800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f747105f2b791db71f2310efdf6a39b6454a88c96d799618adf114f58e1265. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLAM41800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63c82b7a010bdda57365c610a1f7482daf4c01eef371c1ef4513a010cec13de. 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/NLAM41700091.