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 0x2d4e5b927f3277701c1ddac50c4d1d7734c8c9d7055038d99014c90146beae6a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb57d1a0-9a19-487a-9560-9383e54de967.json and https://artists.proofprofile.net/proofs/artist/eb57d1a0-9a19-487a-9560-9383e54de967.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 0xe822dad5fd56473956043a08c41a5df547e6fa028921e040993cbab589ea1ffc. 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/QZFYZ2446430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad48ee151dcf94b8cb194edaa96cf39f063b81c7dd7d0e2e7097958d10ce201d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZFYZ2446431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993e42af8882d5cf7f8fafe41d085be1660a76e44f941aac1293dd5ade07f8e1. 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/QZFYZ2446432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ed7123ab71241032f596e395ae76fa11429a254093fcd9bb963f2fcf398a29. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFYZ2446436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac4ae9fb65a0a627e2ab15208467e3671b1c64e97227efe7e40222e6f7036a9. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZFYZ2446437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4f80e9583994895130ef18f82b0a0052cc80bd5e58a32cfc29eb033f0bd869. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZFYZ2446438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b03dcee5e57dfeddc1fbd4a9b23979a3f99356dd771922f4644e8aaa8235ba6. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZFYZ2446439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab23414cd03291f61db36dbb3c8f91e2b61acf4b7c85b88cfff8400be349690. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZFYZ2446441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b98ce5ee99a31255534ff8dd16813a8e775e4c53c38400d4121abbcac7b21e. 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/QZFYZ2446442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264166b050585c13f301ce13fc2d3086b20d2f209fc923052c6a1e08dbb3cc39. 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/QZFYZ2446443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e1f79dd1123acb4511901f548135dc87de026fef3d32ea03ec681f7c3238c9. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZFYZ2446446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6780e588d8f4672f472c751df22326f7d1fbcca230b846a2326d3d1a2697ad. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZFYZ2446447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed38c4e2d8a9f5df9f024a1d7ceab0ccc5f173c1b1725bbd0fd9574dfcc0bb38. 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/QZFYZ2446448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf86ab5b6133560514e70800780a68e0b7fa6e3e05139ff95af2b86d37edc5fb. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZES82473137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6c368a0c8abbcd60696b32d76966a8ec401dac6cb3d3f8157c66d4bf8fd12b. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZES82473142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334c56625832a04c8ceba949549ca7f7bfeddfb3dba01c54164a9c3272f55f13. 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/QZES82473144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14752a31f78d278c73e9b128fed7f26cb06a8d567b9c8ba849f958b2cee4989. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZES82473145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6df82c627b63a3bd90da8e500b745e35ff56b7e3ae9d7759df8ad394bff6eaa. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZMEN2405968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a1ac7c4eb9309cec6b44ebd898424fdcc028acce4810febf14c860d77ba1d5. 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/QZMEN2405969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19eb69360e8e2f3a92f9437bd78840f55ad0422e74a644ad1dc2891dd417377. 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/QZMEN2405974.