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 0x3d536eec3b8f3d868ecca76c306ccbe1b00de7a3560f5e2e24a569c5d70861a1. 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/c84a9d9c-7795-4ea1-b205-c645983da119.json and https://artists.proofprofile.net/proofs/artist/c84a9d9c-7795-4ea1-b205-c645983da119.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bonde do Arrocha (A Mais Amada do Brasil)
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 0xd9cee551fe09fd9a628cdcf3183405620dca19b9629ab10a053fe5c69a31c44e. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/BRTGM0900191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f8eb14196b5e6b81b1001b08ef46820be128762fb34b98a60046ea02e9cd08. 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/BRTGM0900195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d5a2d552722a8283e642495469559d67d2e3071edae01f447afeb37998d4cb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/BRTGM0900196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612bc5f3906f303b87f45b135b9521d53c6e099e3d47d948e2763fa652485516. Chain 2 (Bitcoin): anchored in block 958369 (2026-07-17T05:20:29Z), 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/BRTGM0900197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5f71c0707f4ca3e243504e9c6e8a5c584700b63518bb25095ef9f498baa9fb. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/BRTGM0900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436adb0b58316aaf41376ef7d90b22f0b78381c608767a7f5b1e095f54f38dd2. 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/BRTGM0900208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaeea84ea6ffc0c5b68d6063b3c9d50ed0c00794da0bae7f9bcf6a2d554af6b0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZ5AB2119546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f79a8941195340b316aa13313ea3eac1819775e4bf1e7acac59f87526eba0b8. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZ5AB2119649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385bd4d9ec404f11297098b7368665817de1ed4cdc30f3a54edc325f337d02fc. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZ5AB2119696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94057af9c27a61ab531656379b1d9ad656ca5175ade7ddea9eafbafd2a162a1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZ5AB2119478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd0161815c09d11a955cdcbc7b94eb5da0ce99ae34220f2333904312f19fc45. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZ5AB2119480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee301fe233bc2bec696f2e1b2fc6c86c7007640595a1f22ad9599570527f5472. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ5AB2119482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630390d21240e8167f7d3adc04b4dcf6d97774e6cba71b8ae207166ee305695c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZ5AB2119485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2654c6b94f96e78b5320c36fafab4b22138cbd5c54548ca630d4a38b691a7a4. 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/QZ5AB2119616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5498b219160c8534033025aaef1b4434e0faee68e011709ce3344880c0d29e96. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/ESA112576947.