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 0x53241c68a0c7d08081f30847cc1f8033b5b19c2d8fc3c60bf67bf27557f34d37. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92659d08-887c-4746-a199-ac5598a41287.json and https://artists.proofprofile.net/proofs/artist/92659d08-887c-4746-a199-ac5598a41287.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 0x39e6af469e06b577bbb1a55ca9e830fdead8c626d9deeaa049c9eabc5775844a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZZ8A2366713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4d23c16683a57d5c4d8e29bc4f23e1e4822a7a80710ed8ef258e62145cde36. 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/GBWUL2374245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15cdcb660b8a126a063f03192de8bedf656931ab6d603bcb5769f71da60b70e. 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/USLZJ2399102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbd78458d630707e9811864e832a1c5946305dd3999c05be683d6475a76f434. 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/USLZJ2345482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a805c35b3330297351ba46559fc0770f9227f03324fe88e6829d03ab7368843. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ5FN2351759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e9b49210078aac60aa5c986b6d88643c63848fd7b70634b639b9b478578dd4. 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/QZ5FN2351732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843d2fb33a2d35d05d55046add9feee200d621a89cef8872c939e844e7eaf925. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZ5FN2351695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916c5c043ce85d6389b826c84a0371f3de7e014991879168a52f4e16874ebed2. 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/QZ5FN2318572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632d29ab05c64f851975f6dff4a079f838da2f9a89fc1077273a1c584ad8a90a. 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/QZ5FN2318581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56bb593744b13eff5a0cc639808d14c94a95ae55a3b64c5ba5afb0ed7674df4. 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/QZTV32229969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3697c7e430591ee606ff85122d621a16df1b4392385f00bcc5d1ad29bad072e8. 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/GBRKQ2289475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89edbef9949dd1b1c7bb8de2fbc3e253161f86d671b4ca835374897751501912. 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/USLZJ2263116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8ad229ea485f5acbb4664d379d089f7f82e69a93bc26906c6e3d881ae57976. 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/GBWUL2147709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0abaf19e3ee881db6b2a93ee83ab4cd0606f13df75d03db9ce6ff0eb63671f6d. 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/GBKQU2091277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9465aff8ebe94adfb425cc2526437079c1e41eff3cb09ec529126f655b0005. 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/GBWUL2018078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1303e931da66381f0f4d38f6ce45733e87c783bdb1a1e3510e35df00bca6a6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBWUL1930719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd9e553f4c1346cc1720a3e36566cce15d8e7374ff5a90dbf18f95eee75048d. 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/GBWUL1929533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf581ffda295492c5327905eb5988b636ba9e71657e9662ef18a7757616b770aa. 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/USLZJ1987375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c64284f8076e4bcc2c08067a114bfdb61ea4b4f8592f924217416496af8994. 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/QZ5FN1853243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5210e0715c55c20a4eec10c56cec6483967fc7e2f88ef7e04723dfc9794a3296. 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/USLZJ1724336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732957e59f903512170ef0d2f7b3795b6c5b68bf784e1a6ee21caa7699fc1eab. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBWUL2076463.