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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 0x859ad066c9a7b84a71e7e5b33c258543fe6076ec2bf876677f88ae3913b1938f. 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/7b60a250-0ef1-4fbf-847f-5d0ea53ef09a.json and https://artists.proofprofile.net/proofs/artist/7b60a250-0ef1-4fbf-847f-5d0ea53ef09a.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 0x861e3cb48e0f6b31709d8ce225f181fc66841eaf95ab9a6f57d79031f14df185. 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/ESA092216198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb74c4f5bd3478cded2590e314d09983d55f161166a04ac118f6c18ecfeb0a4e. 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/ES89E2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c76e7d14c1ef8340afd5f2206f868f20d4e04031506bfe85612e4d51a4e971. 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/QZMEN2396727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fca3153988610d58da0da00ee2020996ecdfdddfdb8d286104605e0c306611. 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/QZN882250809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb63c8f72e0d16738318729599e8fb8348e92d5d6cba5afd97f8f6a98fea468. 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/QZN882225654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125d90d329022eed78a96c49563dd7e9c8923165d1f10a0faa7c998f9808501b. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/ES89E2300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf536e7642a073fa205510dd0a9e0c991b5279e98b5fd61c21a5323585fa6e251. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES89E2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fca3153988610d58da0da00ee2020996ecdfdddfdb8d286104605e0c306611. 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/QZN882250809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107c5f9f3e651d90cf1feb17635abf08627273ec6b8b6bd50c4b198f2a11510f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZN882210773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5884a65c75b6729897b8a0827da897095a3cb662ccdab95121277aeb93047b7b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZN882181801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b75edfa18906035bd7efc792b8502776adecca32eda429bd893c4c1bfef4143. 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/QZN882157538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d96d3d8d206f084848d72b6801b422eb6ac98de718f539e22fec57886047306. 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/ES71G2108031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10219c81ccabbb9be99fe115a255f9d7ff98968c01f4747a258a9ad48b9bd860. 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/ES71G2121322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41c4cd8d215088d4f93318c50071c4d08ce7e547f459f6ba88111371b4a64c5. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ES71G2133129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125d90d329022eed78a96c49563dd7e9c8923165d1f10a0faa7c998f9808501b. 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/ES89E2300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dde53ceba9afd4bf14da505a0d5c7f18b1f3d9d050ae41029cda1227c82eccf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES64E2485267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553072dcc157d9923a79dc0640012517f4c294ff6fbddaaf40d80a5c109363b6. 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/ES64E2461445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1db3412f2622355b838c173d97a28413181eba0ff3b04f93503566d085b696e. 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/ES64E2303564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ddcb4826c31125b2e0416e0631754d6b8efb928a0c2e4811723ee71088d579. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES64E2301992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a795320de21303e687dba536edcffd5d2ed243fef159575d6b739677beae3b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES64E2201998.