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 0xbc989a3b8aaad26ea55571364bc4792b7f6fc60b8f46e98ba2c98e70ff83bee1. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfd2a290-9b9b-46ca-82a8-3d17a427169a.json and https://artists.proofprofile.net/proofs/artist/dfd2a290-9b9b-46ca-82a8-3d17a427169a.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 0x3d2e529ae6c98dc05c93a2d46a992514431b9cd8c7f90d94a7e48798a69483c5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CAENV2540446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11775cc345f8ed6bcab63a8706ea142e921163167b2ba41accf570ec8fa4fdbb. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CAENV2540444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0867101f4dd541d333ce24bbdf43dd8b86275b016cd285a4b44959bbf5ea45f3. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CAENV2544239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6de4c60ed418c7e2226bf622ce51b2605a0a40da3529a31e54c9f50b3e4cf0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAENV2544243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad9997dea4b6fb8ef6fdd0de0e97da39c9a9d5dd66f8b99209878dda1a2972b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAENV2544212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1ba966af66fdeefaf2210743fca9d7a0ad961029d141e3784a70829056cef6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAENV2548980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671ce284e2f18a513fa6a59c2c0b38ec0173d791abe171cb24b4f9e85e408256. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CAENV2548981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733f62da54389d5d64541c98282542389bac6e5f6f09888568256b1ea3f6011a. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/CAENV2559097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef5b3db99080efd47c92a72b3218b9f0016bf5b62bb78907ddb6a693c6a9668. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/CAENV2572839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714571ecac4728186a3154db721e59caf05c507b4c76d7d787f9036c98c22b28. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/CAENV2588724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c81bbac1338569e17287a4f71f57705013a4fe318170d93c9909074b5ee54b8. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/CAENV2599357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec41800fcc20445aebe36b9a1de2f6109bdea4c3186c82d26468e59c7d36dcda. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/CAGOO2514146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ec780222fd6c2923b24a7d8f2da52f6526fc45bdffe9b3a71ad39b9c3a3991. 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/CAGOO2514144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033b8d58d5670883e1785c610d2f3a7bbae93c5e33f7d6ae90d12bad99fa3b71. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/CAGOO2546790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2799daedfc9f2584cb02f1930e203e16f862417374313b78cb2a6ace4713e29e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/CAGOO2552667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5350ad929a10711ac1a69e8e85b8ad928fdca97e22c7868e9e541bff228286d7. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/CAGOO2578470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1ccca619615c4b4f1414057cb67a7e18c8531a1d75208c9f5f1d6ba1c4e771. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/CAGOO2585037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253eea3dcd6c47fe5483ecc4d6782103a115a11ff90ff75a015f6fc40c1d498e. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/CBEYJ2533913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c9f0b31832349ba8c08ec2c98460e90d0f8445d6b8730ceb18570388d74d35. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CBEYJ2533914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab079db0b8e1fd8a5f06388321eaf0c98822b22211c92273d2f920777ddd570. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CBEYJ2533916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16eaf347a94c6fff3baa8de0d95c81113f98bb2b63cdd15a1f6b5703179721b7. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/CBEYJ2533917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b67c07ab2329d4db26803808ac3648c746072fd1ad3f427379b87825d10d4b8. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/CBEYJ2561049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaae38d09931d2a7e717335652189d7dedac56eafd90fe95d453a7cf7ef5fa9d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CBEYJ2598331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f80d21ab79969991604f3bcd87ada1b8f4d1a7e92d50cad36cea82cd6c96bc8. 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/CBF8B2502399.