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 0xef3a886efdf0ec26d3769459bb7e73574129532fc8aa914806f49d84765b715f. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3faa2100-ff51-488a-aa6f-dc88f578b73c.json and https://artists.proofprofile.net/proofs/artist/3faa2100-ff51-488a-aa6f-dc88f578b73c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
O Quinteto (feat. Ivan Vilela, Vitor Loureiro, Walmir Gil & Raiff Dantas Barreto)
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 0xeab1062d1cf5cbea504b2827b5497b9eeffc6f21e710b3723e82ab78cb2c4cdb. 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/BRUUL1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa605ac75dd2ca16c21cfe6a3770610895b33a634ff03b35d9c0a00d5e3f6f4c4. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/BRUUL1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674a7573a8f15dd71a646ae2a4fedc3739030a6d8646b619ad3e38fa546b9d62. 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/BRUUL1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a247ea2575cb8415b35470df623f4351d5ec24cb174e70816201088e717e5a. 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/BRUUL1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414effd34ce2b585f4b4357c280503470a646a049f0b54f4701ae16639f6ff62. 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/BRUUL1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c45e34e18d239bef94c0d3e8209be9c757998cc03490ddf90cf856056122e6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BRUUL1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdec0a408d75cbfdebdd3ecdaf47bb2135d5bc5bf2a04e52f4e0d9dba8e20148. 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/BRUUL1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6320f301404f01b6e0d5b375b24424aa9d74581c2835215a3340a10414b8a40c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BRUUL1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9717a221270a794db443732a8f148ca6554c08118171b84cbc429bc6ea83957. 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/BRUUL1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082444cbc65f7e8d099c98a459612459c053b55890a1a6d7cba7574622c045fa. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BRUUL1700010.