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 0xd861a6329572077839b791f75a428fc88d0afdd7371f169846182f1af171fdec. 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/89750431-f440-4389-9aa1-d9cc3ee1b8e0.json and https://artists.proofprofile.net/proofs/artist/89750431-f440-4389-9aa1-d9cc3ee1b8e0.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 0xcacfc953fd31d664b3f331fc4376dc713db1a5ea351d091b3e69ab2b99a21f75. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USL4Q1823351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c862fa2580ffcf6248a926ab95d017f5deab68a05e097d3501749a603c6b7e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USL4Q1823352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb634fb40f02fdd5853a2d4039ee8fd87a7cf64aaaa4cdd2804e96f0ca4bbe97a. 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/UKXN21965821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2faa3b1b81d52b17400ee4a66b2a7dc08c6d3bce6e9f8653e29c1b55f2b70757. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/AR6B52200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2faa3b1b81d52b17400ee4a66b2a7dc08c6d3bce6e9f8653e29c1b55f2b70757. 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/AR6B52200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf23dd6c7f0e45c33f97df7401c9902914c935b805a0b1c4338c965faee50ca6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/AR6B52200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf871ce2e72d7102a3ef578f00f12ceee1a745a680f08eb366dc8512b1e6f079c. 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/AR6B52100088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1f957135524a0acdf6f8ffe04c1cb1f2c76f9f49616c5761ca0f0d9b75f63a. 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/AR6B52200069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d515ae56f681a075d2a7c5bfd4c6c227f51ee8fdce95893a4a9e4d566bd32a4. 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/AR6B52200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eac6742f76e2a9ddb298ce798e6f49b3d65e6d5ff8073e6979fec99831e2dca. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/AR6B52200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b4555f1241bad91fd2163b703fb8699bc7f536143d28f24802c7d3875d619f. 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/AR6B52200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d2ed574389da1a7ada85893369686722f9c7b515e6ab7497f40c3be4774ebb. 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/AR6B52200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960aeab6311e20e3a6955492075d3fef2e3c94fdef50ccbe337b55456fc212ee. 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/AR6B52200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842975e5a8615ef86ea4f3421ff8064e7497843cbdc266396c32f84fd5e1efd6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AR6B52300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348045c732bbdf5d88ce2c4df8b6787669ad65120cb70f285fd5f4192e16fd42. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/AR6B52400069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7dc504a6cbdf30300f9155c75deba382ff9172e15579684313c602acd02cfad. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/AR6B52400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed04d36cd9a1feb9c1cfbdc09d188ce1c8734180eaa60d0fec926a973e74dbdd. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/ARV7X2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e880fd37e55212d01311fa9722c228870b50d73c640a8bf7907e2387e32535. 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/GX53U2323806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017502a2bcfe8b5c5f237a0b7fcae2c6b3b03f72a4ace1171abc537e324a19a1. 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/ARQ0D2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba94cd952195eb785d0159e24ea0a8d4b857886975007e648fd9a20d86a04c39. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/AR6B52300016.