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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4cc65dd50b1afe0e826a09e71419531aef0da3d79da2b965dd5ed840ea2cf5. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3cf628f1-f2f2-4220-9f57-010ca233a6cc.json and https://artists.proofprofile.net/proofs/artist/3cf628f1-f2f2-4220-9f57-010ca233a6cc.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdb46c2f463b45f50c9557b94fcfe8c6610181889b782c50025ec818cf073ef. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NOHLK2301070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5795140748eae4cc38d8d6c269bcec0c4bd2993c8748972e4c9a618a1e5710de. Chain 2 (Bitcoin): anchored in block 957212 (2026-07-08T18:33:44Z), 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/NOHLK2301080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6af2bd92fe866abb6b34cff61e1aee8badf5e0aa70890a94798eeb326c74a0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NOHLK2301090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf731b06691476b1afb5f52bea6fa5fd5f2381846e9706a25bc7e282ecabb5fa. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NOHLK2301010.
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 0x846f1910d61e724b372a146d991bf845550e0e9cc72a8d1389c28026a995f162. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/NOHLK2301020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9739e50ce578562adfc593f2995d0902775dfc03dc72178cd1701e0d1464468a. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NOHLK2301030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c221f748c22596080a6f8bf91d9caacffb119ee1da52a649486821aea5f009. 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/NOHLK2301040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5652a692b326cd241805361c819fe591e626ce10a57e8b01d6a3dbf49983dd9d. 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/NOHLK2301050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bb6f795df4fb14457d2f2d15e06a5f99d55273c0bb9de0394e39d07244125d. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/NOHLK2301060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac4b809cc47fc3ea07366b6a497121ffd9fb17b716e0a2e7719a4bd1e66aa48. 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/NOHLK2301100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542a288926d287af54fd1cb57949f089dd4d69277f3c9b8593d7bab8c54b9fb6. 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/NOHLK1702011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7ccd8a9b4955fd28a8627761dd16e72b4ee51766bb579ef2d9177863a3120c. 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/NOHLK1702014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a9819737ce48ba78affb4f2c380ca9598a9f4eec2c38e6b5a547c070a99518. 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/NOHLK1702015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45371880c669cf6ea13986df9510a4a62505e453890b2e70ae9c56e5c3a2eb8b. 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/NOHLK1702016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d48cc044ba899fb7246e35d0e362f565b45961f197115ea97d735f31049267e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NOHLK1702018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947c77cf0ca1e61f8ac36c8e84310e9c819c4ef2a9e77c0fc7a4111ae4f578ab. 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/NOHLK1702019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd1c0fe212bd0a2ca63a87b71064874e80268ee679de3dc5ab920249dd9c3bc. 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/NOHLK1702021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87bc5ca0219d0fd6c4718506e5066fa022bb6d593ff88333680590011bcac7a1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NOHLK1702012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ba6e352803a76dfd64543264ba31ded950435b0a84d25914fdae8d6ebf47cd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NOHLK1702013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad15a05fe45804c31a65a5b0dd88a0e522055964d42e4b3e17253f6f6dcacea. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NOHLK1702017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc925128ab8254040141b910329e27815de0073c6ceef69ed995f3fa3c2a01960. 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/NOHLK1402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc9014b8886627fb5be32f4c9e8438f44028e4e850089a9f5f700e676c716fe. 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/NOHLK1402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef93894e908cb61f5603f6dbb92881bd64cab93fa5741f17a48d91e3af629999. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NOHLK1402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f232a8d8142efd71628805dbf847b91365558f8eb570aff82b375db365c2ef. 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/NOHLK1402060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad68f527756fed159dd75d74af9406a546b6b7baf2c14436d57edebc2e0bf847. 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/NOHLK1402070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa845d9ec2b246584868e852c3d68477732dbdd117550e2a1f7fe663af1cdc9cf. 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/NOHLK1402080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834c44a71777aace0d071c6c6aa9c3c48dac360ad3b94c7f951647f25bc5b711. 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/NOHLK1402110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fb9a030644b0f69eb5343db6faea495a4e1f9102550dbfd57b3f80c5a9e1dd. 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/NOHLK1402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5948966521ff67d926cfac184cbd34777d2e74df1947ea18b21a9c8d119041. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NOHLK1402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60428b6fb910a4530794df878cf5e7bfd9e3e49cf2469ac9113ed567957c689f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NOHLK1402090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6ba5adc5722c461e8e99cbb049da55d03ba2ec70c1901f103a74c234834591. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NOHLK1402100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf154ea3450355ed0c5fdbea8389ff056ee05ab695c75873ab86c5eda0348ec63. 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/NOHLK1801020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6a825a796de3e1b7e75ae5815f2c39536c42f5e7b92f87214ff18605ec37a4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NOHLK1801010.