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 0xa7c871dd917ea480fb790cd5d87900dd3bef42e53ab49acbbcd13dc21ff0a85b. 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/6f81204d-cce7-40bb-b6c6-2fec04ab72bf.json and https://artists.proofprofile.net/proofs/artist/6f81204d-cce7-40bb-b6c6-2fec04ab72bf.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 0x78630872041d9c1533ae9961f3a437d96a2b8df761e01b7a6b1c740362562338. 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/HKD012270694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1712efe281faa074fe23e5706748d103c85a811ae7a2d9a79774d0a0a23c2c10. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CNM011030000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc566ac6d3a371fc3c35901325d6a28b8b8e116be4395d072c3ca9d1bcc0d73bf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CNM011030001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebf2985b0326fecf1bd295fbf097d8bce0904c2706b40b98b38e7947bb6e56e. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/CNM011030003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e11c2c77fb155129d8a18d98fd595f5f57ae65511bdd2254dd8ba5746e732d. 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/CNM011030004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9ce6f445883db433c5ec4196f2fef68ac5aea06cb562f958629df523e91b9b. 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/CNM011030005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b9dae7e63214b67230e9014944801452b96fae6f2be2f746b58aad80c20ad9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CNM011030007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda97475c4390a871c2123a72e4c8ebb402e8832b77e98866e87e90c7ba0c87de. 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/CNM011030008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264791d74d73a02948c8ec7ce690675b60053f9a4ab225c3f7c97efc7b172c6b. 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/CNM011030009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368d645dd3df254c4832b106752fba8c86a0f5854bb1b1c7350c9fbae7d156f0. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/CNM011030002.
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 0x71b27c1a2a911d1c9425dd624175d2517cbea72b065f221cc00d367da879a4c2. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/CNM011030006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474f93732e23c515b3b0a021c80cbcab7282ad68f777d181686b06c2c25ddf63. 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/HKD012270858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d382e2695f626c6ff8f70c22227750be964b7c5c596c8c5d890216ecc996a1. 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/HKD012270872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849335902464c713bb9d7b9c604abf48bac9de4192150e5293c3485c16a86080. 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/USHM91094280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba58944eccce821358635e56cb543dceb852766a15e47c576bda1f3968e8f405. 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/USHM91094281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3c774a49742e74a102dc531255a47a97d3fa1ae0eb7939a64bc69df3715739. 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/USHM91094284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcd5cf6cabd972a5ea91f73593c50b898c52b6cb4ae87307f6df13d6bb805a7. 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/USHM91094285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa548836f86451dc52294964c49a76fe11a4a7eb3afdbaf47c296f47d3b8591d0. 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/USHM91094286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16c296e79201b8df1c92ff6920b6e2aa60bbbfaa88aa95ee9979d627f6adac4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM91094288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94b5bd7f02ba1cdd5c4a69e08f544e5a4290b5035a6a2592beeb8db689d19c4. 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/USHM91094279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78756884af906303e73c7cbcf1623e0075c6f5e9dd7934480c72406582350eb4. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/USHM91094282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3ec9961b06631c97f755b9e35d886e4ad9801693704cb7feaaf07d376bc241. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM91094287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9098255e401d3f5b64dab30393389a040501168bd6cb813b99d76e7424879c41. 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/HKD012269747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afbfc95fb65506d47102ceb3f5e1cfd113d26c6c367ca8680216a441a984134. 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/HKD012269746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ce7803e41c6f92e823964145af068e58074d1981cdc658604c17a0cabb42e4. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/HKD012269745.