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 0x90ec09db03e55866d70d22a6fe252698f59015dca48a64d20bdf0f8f0a9f53a9. 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/e9d221ad-894c-4948-8f0e-b72ed5961f7c.json and https://artists.proofprofile.net/proofs/artist/e9d221ad-894c-4948-8f0e-b72ed5961f7c.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 0xf740031691234fad82fbbc503901421c96b41bc4c57c85dac5e2cc47d05b4a39. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SGB502301255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d379609176953e6f66aaa9797ca445979311164079e484a0a5d6c95c6c3b541. 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/USHM81849130.
De Tanto Te Querer / Querendo Te Amar / Pirraça
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440247240240902da91e440c86822781e5c334c3d0753108e39c10d9d9f4b1a9. 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/USHM81849131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77f6933e44cf76e32967ced3252cafb6728d621898afffd50767990b7e2b38a. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/USHM81849132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25de174df95caf625707fccb6fad8e6d6f6f0573cdcfa1fd25b6de141d61a7b7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USHM81849143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca072dc626cefcf06e0eb9def08da7b79630e5fa01e8b808bf9c6a8acdf80912. 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/BXNBF1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42980bfcbd6c2276d0a2b76bdbe19592b82dc0696d89509abe409633abdce772. 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/BXTUL2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16447cb35325a76757087f6093a14ca98bf3bb0288f86eba1444e539cf1aec27. 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/BXTUL2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27228c6b770586c034649e78a027b7422c16eb77fbc41403eeb143298bb2e8bb. 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/BXTUL2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb842a03d1ccea74b1185b1a08c47cd88dec7bb6f333e5da040ac09e8262f5e6d. 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/BXTUL2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65087ca090810ac130a9a5c78e3d5bd4aeeca14f2fb034c20c9d6e6bd3148782. 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/BXD4P2300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f1164421315822fd1f3c3b3cf52d0488b667caa0df739eaf642559566f573c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BXTRE2300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68852baef5ec4112fe9b913bd6f910e9852422b2c0127400d022df44d8397fb. 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/BXTUL2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88c7caffefceb36f2dde0a8a3069fac774b44099abb4236cf0d0fcd5b3e0de0. 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/BXZ1D2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b70cd6184df4bdcea42724f90083dd48d9712b4dbc4d764379bccbe2f4e8ede. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USHM21927526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13395bf18b8ad960a189084de2746fd023aff24ba99680c0ee2c81157f5c2a63. 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/BXNBF1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a865407e97050f0b8de406c1a1b3b790f8d866ac0247f5f597f4367e2e4830. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZGLM2329629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8f3dc2b63643dd0fb31bde0aaeddc60a21ee1efe568ccfb808afed022fc4cb. 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/BXTUL2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98eb4bd00130a57e510aee1626eca92b8eaf5dc6d6ced4b4d3c70fdf39213faf. 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/BXTUL2400008.