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 0xc9c3d58745aebd2f1eda42534b52e39f222f7025e467d5427c4725d881a26807. 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/d90d2c1b-0dbf-47f6-b7a0-e19fb37cbde6.json and https://artists.proofprofile.net/proofs/artist/d90d2c1b-0dbf-47f6-b7a0-e19fb37cbde6.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 0xb2b1fe6027f3f4722ec9e3945f651d3ef367157368b175bf55df969c1c04a2eb. 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/USA2P2436299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1873e56a1974a6277a78d4a10cb9ad838bda32ccafcae06f412e5cce52e529. 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/USA2P2439420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb05044abba668a14a025b2495a9fef25a949223ed82e59f7feab4782d37bae0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOCKK2351010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b478caa1f4ca13cf619da35c19b0040ab7773d90f44dd985a94a0106a5b6502. 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/TCAGO2226792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1df570081d0a0647b24f3d56fef627683399298d057ecfae2feb1cf00077ec. 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/TCAGE2230285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8f781fdec9159e0a5f4d584e8f21a1a49641616faf77526c4f2a718535b9e8. 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/TCAGE2230241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1650d5ddf65b8255f17c26e7347f3059539ee9a15b7a86a5382d6d8b85083cc2. 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/TCAGE2213666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f27d1754460ea5cfbe21a7f24fa2b02b1dd98b9bff1655bb7c8ff1ee5136aa5. 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/TCAGD2295974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe041ac0a8c10c14dfc986bcadd276c7f1d2a18158544d9b90c4018b697ca8105. 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/QZES92234881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074def458f62de89d85c6fd8f371fc3a4d96e139d91f045088f7d74f3c1594be. 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/TCAGD2214829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2beb8f08cf177e36d8c98c211ae3b05fe25728983f68e462f8b488071516ae50. 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/TCAFW2135860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9c375751c9803bc6707b2353444441cf726f96e39b3c34ad0ec379b418167a. 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/TCAFW2111350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6feb668a4e2151c8823ca31b8b1c14df865cfa3431225d5aeba416c62829f9. 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/TCAFQ2130220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bc33efcb1119bdeec495d013fb0af17ecf4bb1f89ce7e53319a75f7be4b682. 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/TCAFO2166019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d52a8b1f36542acf2aaedcbee339a8cb163cb08c602efdc651b62a2fd12f9f. 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/TCAFJ2192658.