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 0x820fab894c4a2e3e8f4d7a9ffe20acb36cc418ab854a1d098d7662f648a4869f. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e255661b-e0ff-4bf4-aaa7-351b17fd4482.json and https://artists.proofprofile.net/proofs/artist/e255661b-e0ff-4bf4-aaa7-351b17fd4482.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 0x14f30abc93f6a674483d6e77803f7fbc3f0b9faddda5bd83864cb6aa993b0138. 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/CAC0C0900118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547962b91f300fcbacde1e1ebe9ce85ab11c0e6a7c3f2408f7fb348248143059. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CAC0C0900119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc890ae2fce54a0262e463437142f413ba30102657984b7b6e86977d3d8c4035. 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/CAC0C0900120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106b007bd833ecd1b9a836fcac3e47eb020e33ac44b7f68266e31f2fd29c64ec. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CAC0C0900121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723fbb839741d89538adb37341b3f9f8a0868d05fecfbccedd94d94880b5cf9d. 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/CAC0C0900122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081b944e66dd1ee919d0205de7e5b6c779d49d6561ae07f35b8018b1732b9144. 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/CAC0C0900123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9858eaa02abbeb79309563c8436e95db875cb993656dec9268f054406c65e2eb. 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/CAC0C0900124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1363b3940b75372c638fb0419f20e0f646dcc647bf8455425c6ecb0c25001f4. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CAC0C0900125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f28a7f1de0d8d91af57037ffeca0a34fb48af6556bf494c651b905c761cbc5. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/CAC0C0900126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922e21575e1105a6860a82622c3691d6d644e6a63d4e430d2719ca63a7554c80. 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/CAC0C0900127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce5c268860a96b8ca5b0777685a9cd3dc0580577616e84498df4e6a68e0223e. 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/CAC0C0900128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4cc7f18984152c690b15d77c4e12d9d4677be08e7fc4a30c08c26523cd7df2. 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/CAC0C0900129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c063946e38f688ee0c02f984b537bb19bb985b4c6aab3b7568e4d243879afbf. 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/CAC0C0900130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ea3047fc1904d3e58e7d0b81157ad615d8d9e3a74b8e734ecb89a2fd01e6d6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CAC0C0900131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa864e7fb3317737c67a342a5b7954936a786c96a0fc79359769d3d64954aed66. 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/CAC0C0900132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c83975a596eb8674e01e2beaa8b2eaf8bb922c00af92205a7dc132df89980c2. 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/CAC0C0900133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d3cbf699e4dc26250873c690edd24a798f3a4c5320b81bcf04d129ce18d62b. 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/CAC0C0900134.