thumb|upright=1.3|. A casta painting showing 16 racial groupings. Anonymous, 18th century, oil on canvas, 148×104 cm, , , Mexico () is a term which means "lineage" in Spanish and Portuguese and has
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 0x01fac7b0ef0d25677e112cb0951c4a14a45031d39ca3b3091426c97d8569c127. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11606096-f2b7-4502-84da-224cc3b46c4b.json and https://artists.proofprofile.net/proofs/artist/11606096-f2b7-4502-84da-224cc3b46c4b.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 0xde80caa9bc55ac96b4402cb28129d13405184da28e865ee144a7fdce7e279ca4. 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/TCAHZ2432527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d02f5fb32d3082b51fc294b20bc03420ef16b30e8c9ccffd53df105fea7514. 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/TCAHZ2432501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1cd9325cd261d00a57611afba53ff09236495a9a583235bb31975a55bdfd4c. 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/TCAHZ2432583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8a96b5d125c3c5607e2f69298af97cb68853319c8516865ac5d357df49f964. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCAHZ2432602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20d9af3bd9812c263f09d0a10361ce53041da170be1edcd68403069064cd7cc. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCAHZ2432573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc138472a6a611f9b1be71ec7a5f9146963c96c520e07fe4b74476159b82ed91e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAHZ2467418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb1b9747de5e0b4a878e3ec4b83f077d89c6b8cf77bd39a9e5a3bee8cfff6f4. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCAHZ2467451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a8c55832003a2735ae58a3272b1ab9675612fbb97659de479dfd5963ac4401. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCAHZ2467397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d15e891f3a987acf7ef6cdf5a3d011a8705e249587b270fa19769171d84b05. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TCAHZ2467383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8192d7f484aa346ccf3864bdf2dadb5f94b038c3a3503ee6178fe520494d67. 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/TCAHZ2467438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92d63e133ced7a0dc9629e5efa8f4e8fa450e7eaaefcfcef4f52d9315d752db. 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/TCAIC2488258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9713a8807a91e57c864fabfd768806a017812a0433c0fdfe6229dc0194f7b91e. 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/TCAIC2488367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa182217db664906d103c5ddee64d9a44edc3818f88557883666da0c59c31db57. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAIC2488283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8938b2617e9486d6bdbff56e28c5b6bd1a037efe449d7e6f4b68b46944436a. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCAIC2488322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8215655ba27d2dae4e1bfae10413be07944ee5b4f5a974dc4529b54ed5f2eb2d. 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/TCAIC2488347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e299079409d633591d97a9e01e74df8d671803a3a3f2c0e8cfe34afdd8db43. 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/TCAIG2484892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead02c350b9300daa055ccc1e9c44d702fb61374c86760ce2b006f8554458512. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAIG2488454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409757f6a781b730246bb01f6124dcff0d95ba9c28ef08fd646a4276431f01b6. 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/TCAIH2488485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482564f88ce23a282b0e62e26a8e3cb1676aa21077784ce0981b07d36e61070e. 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/TCAIH2484968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3f6c15ba817ba282db5c7fbd55133d9195ed240aa3f49f435e048e75dedc02. 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/TCAIH2484933.