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 0xd6e7b652381fe58c656304f420bde33f7c888c21ab964f265796a993d0dad304. 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/11425687-a40f-48dc-9221-e099b5207a1d.json and https://artists.proofprofile.net/proofs/artist/11425687-a40f-48dc-9221-e099b5207a1d.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 0x67b8a9812edc0e3bd8e5fe39c40a7238434182a345a4ac0fff837df465629706. 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/MX3741200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280fb565f39c0a2120f744764f0cef3c09706f7536d75c49f43c7573761b27d1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/MX3741200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62257488ecaeb5154e1b9b8b8b69e19c038ce671e04e69442d99244a3a19ae3. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/MX3741200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2bbcde23d38371caa94e578954afa9ce8d2dba79b1f8690c5e03dabaa6ddae. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/MX3741200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58489e194bde18d47ac7f873091fe7b8b004e8d4170e42ae2eb66dfb5f502ab4. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/MX3741200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559f85f97106404d427bfc2c301e5d2b73c717f35344fa068d9bcce14faa5b4d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/MX3741200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7cedf16c7a80153ca73604d44905a34b5e412b58b3c775473436e2317c5823. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/MX3741200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9934485930b2ce26208b538297a1d7cfacb27a14fff0f3da29d719564b7b8d2c. 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/MX3741200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2bbcde23d38371caa94e578954afa9ce8d2dba79b1f8690c5e03dabaa6ddae. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/MX3741200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58489e194bde18d47ac7f873091fe7b8b004e8d4170e42ae2eb66dfb5f502ab4. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/MX3741200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559f85f97106404d427bfc2c301e5d2b73c717f35344fa068d9bcce14faa5b4d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/MX3741200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7cedf16c7a80153ca73604d44905a34b5e412b58b3c775473436e2317c5823. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/MX3741200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e67d24bdb20bf4f77596f9704a754d697064bd10e6f3f853edb01dbf6c9271. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/MXA591800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef99714a51f14d9db8fcb7c783c2a03d7a5579bd83f67ef35c9ac1a298b30103. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/MXA591800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e67d24bdb20bf4f77596f9704a754d697064bd10e6f3f853edb01dbf6c9271. 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/MXA591800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc1bc80b47d0141ae591308c5170a0aee10a6b06eaa88a9ec6fc3e59109fe16. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/MXA591800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e041c2366162763f7c804b0a249f615df13b81f28255f5e8ce981f0133fd32. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/MXA591700042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f2e4a094113798ad4eb6ace449ee639e161fe569c8c4189635541520c84764. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/MXA591700045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6173161844ed859c4303bc9b9abded7a3e7e61333468cd51fc85b31c907aab. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXA591700047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f3a3652bee6cc8b2e91605a38c9481355147e1b96fe0af0f15d28944314ae1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ARIXB2500001.