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 0x87b88744724154f0fb8d563ded6ab322866f1655a1e53a29e17a790973a0dba9. 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/df192517-ad60-43ac-9c3f-cd036e31a262.json and https://artists.proofprofile.net/proofs/artist/df192517-ad60-43ac-9c3f-cd036e31a262.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 0x9be70a68203a37dfdb411ea81c729dcfe1ddbc15d980e6d1a77d7338d34054ca. 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/QZ5AB1647382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964883d61eebe699402f3a1bb588a1c54703ae431a63132163d4ba0f4135d474. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZ5AB1647383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f16f84f4a2b2a64bb28b64d969ad91ed09ccbcf7a9fcff43c04774022b743f8. 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/QZ5AB1647384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0821b68e142ed3af4d458d47cd73a91f61299c89e8fb06d3d4d9ebc57cdd62c5. 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/QZ5AB1647385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19644a558958434306ad5183d823480d8a04965202d5efbb903ce016152824ac. 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/QZ5AB1647386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d92216578cb129202c2b17abd2812426b92298c935226540120e6af51d5aed. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ5AB1647387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa219c934aa9851e9fd329967ff0a4d7fe820dde9a74bcfce19fa494a78d52acc. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZ5AB1647388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9117fa05a231615fc84fe6aa15a2a1649563a2d002abcd6dfdb6e483eeb39c8. 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/QZW9K2372100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bf6761a8e09d84a8ce204e6cf17e5a88f94c8ccf8097fce74c95fe9f1ae1d4. 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/QZ5AB2352332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30b3671034d04ccf5e854d834a46ae4dd57a07a1f65894769a07dccb6663835. 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/QZNJY2271848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc400eec3e6a6c9f56ff98daa7207927154ffc68b2835f5ce68d10d60046638. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTPX2103207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9315d0f3a0fc0d0c9b925fdb76c0d626923921a93255b52042b534664a3e5d09. 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/QZGLS2100253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d37498df9b54cc093ea22f38b6052ae5f1fb6ec6f2ea19bec205cf9c4bb40f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNJY2043331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a2f7e1664815a4f421c49d4708ff2934b081889417e4d9c396f4b0b29b083c. 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/QZNJX2014226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9910f044766adebf86be828173edff8605ef587ae83bb8dc3bbe2a4dde7b64d1. 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/QZNJV2014593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927a874114590cd4aae64cf93e22891636a0245e3d18bac70fbaf41393ac0847. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHZ41927883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0813f0ae0192143a9c164e75a1788d251b69381216cc629b6a3b390b1795c2. 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/QZHZ41917556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f54528a984ed2ee252c5bcab451e7f68369f86541371443b2d82bcab146e5b5. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/US7VG1948742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e5bae2adc09c89df9bd0166fe828dd830c418c1f3f0cade92bc930e7a559f4. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US7VG1847873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccf17cdffff6aa0adc0f8eed7666ddda50ecddd0e9575004b1760d5570fbbd2. 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/US7VG1852792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb968aff65f712b72c783af03fd9f6bbabd698cc328b42e18e045388d9cb62a3e. 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/QZ5AB2082333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2ddd5f2fe9b9a86fccf7c8c7e69d4f61881303cb6afd3cc1472dd8fffdf48b. 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/QZ5AB1999974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949297d8541d1d8cd7ad360be2492cfe2248b0cec144a83b20f3604a32dbb8dd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZ5AB1799315.