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 0xa7f06690b63c65342d56d7d0145c0cce9fa6560ed932e91d0fe66c987554a312. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb2dc612-8cbb-4415-8d90-e5e84a0b0542.json and https://artists.proofprofile.net/proofs/artist/eb2dc612-8cbb-4415-8d90-e5e84a0b0542.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 0x4405d54d7058580499e45504e7aac028e35b6d7db26e035f76873bbeb64a060b. 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/SE3OH1727658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fb244585483251e9cb2970774abddc258ef4ea7121f623f0a26f3431660d7e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/SE3OH1727656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03270dee1a3388015b69a968fc8709b2ea9bbc88b4da67b37b94a1f4f848defe. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SE3OH1727657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6319e05f6384b72038b9d1014aac0c0cdbe5546ef1cc7aaf06e9d8ca0ead14. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/SE3OH1727660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185c429674b969784e6926c935fc8270aaf8269beeb7fa90bfc3abf976613b89. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SE3OH1727659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215e4486475c6e4b5f1dd438dc72aa95470a5a15af038fb187438738573f4037. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NLS6R1862341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09d6a72d86273d9cc8a319b92c738f6dd2589630fd12ab7091056a4862eaae8. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLS6R1862342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fb9d25a4f2ce9a3e2c6e3b975fb348250149173271bd04b3a68c733bf6d2f7. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NL1AP2034080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaea2359748dfff2e622ab79b4e24f0c94fdb3144925b21a8b6733bea609f53c. 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/NL1AP2034081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a878f432a458d81ddcd548632c8f0cadc76304e3648098819cba9cf9b8e497. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZNWR2493546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bf6c4e9696a3e4689c1f0481f43f078e1c432a9c1d1ddd7675dd9b8a97c200. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ITN582403794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e41d10f4c5f9c3e6bbece017b5f4938e691f6aeefe6e65492b4308a6bed73c. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/ITN582403795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dba90506beb9013938944a6681dce57d20a974cd5b64dedad3f7406e52ac872. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/ITN582403796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb544b59172fea60e2304b8e8ecc4cc40d5b3fae5b206f7ae0b065a8b24a060. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/ITN582403797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040abc16573546d7473857d3a8b7a3e238c72aa6e305ef00d2dd367ac2a3214d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/SE6JR2517001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee8a6b8c71be4dbb973d8f730a8abd253ceb3214a2f4f12ba870235bbd9ab26. 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/SE6JR2517002.