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 0x5bf2aa71d3ce2f1d3869a4d7b1395704de736b35e173607644bbc76b457bc09a. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e0fb08c-c3c5-492b-bbfe-d0b9063e06c3.json and https://artists.proofprofile.net/proofs/artist/4e0fb08c-c3c5-492b-bbfe-d0b9063e06c3.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 0x251934dd473a44bf20fe8a21aa48ae04b73d59df8af9fd4e54ff82529cb3be57. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:44:54Z), 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/BREEI0700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d48013746eb71caf2e8fae875cd7755cbf94d2535c235bcccb008b4eadf217. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/BREEI0700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfd067c1067c317e2c076a82a1db40f77a88e55f807fe82fbccec1378f43560. 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/BR13F1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574a513fc525d8c34d5249899658d6bbba453915c310cbd9bf8c4d983b63ec05. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/BR13F1100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7020e63aa360ca97e33c1dd53ef862fbbc57917074f917686bc19a1268ccb4. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/BR13F1100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255971179a99a0935a82bee83c11c9a3f49e68c0e1f7c98927911296280e43bb. 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/BRHOA1400012.
Manual de Sobrevivência para Dias Mortos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e7f2753d357863921f54c84af5d4c170946d9cff3e21525b9c7f08e84bd26f. 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/BXZ9E1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261025a14cacffef221852ae4b34190bbcf9f5cde1289b6be0c810d4fa618463. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/BXZ9E1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b44ee045cc51e480ecb6acc22fbd485e6f10703cf335aad587be69ccbb858e2. 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/BXZ9E1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc7b233ba9a38862bb06195d0a6efda40a24c08f5ea07c26362beccc2cf6322. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BXZ9E1900002.
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 0x9350f2ddd8f7e3613c8723825ea6254801c0d37be84dbb759c59d742d223b601. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BXZ9E1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a048105f221a8cf2f245475b49623a042db26e2081259388eafe732fd286876. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BXZ9E1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc848bfde3bf0bde449640216c62556b8f8bd53f4270cc47adbc9e9e991f13b1c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BXZ9E1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8c7d67da9f1f4853b52cc683858f909fbaff34a6eaf16cafd87336948b8910. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXZ9E1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6151bcb539ba441b233bf3ac0cb26e905ad16c6bd3004988dd2dc44adca334b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXZ9E1900001.