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 0x0d98af604aa5761ca9114be98d39047731d3ed2d7b7c3530870c7a370f0453b4. 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/817b6041-d687-4b73-a986-225331715e8a.json and https://artists.proofprofile.net/proofs/artist/817b6041-d687-4b73-a986-225331715e8a.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 0x05b33b5778568ddcdb9ce65dcecc2a122cdbc1e4e2f97903261a64deeeac31cc. 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/TCADR1813470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d045f08fd9d639d76b51117515fde3b9e42539a425f86efae2b760fbd173924. 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/TCADR1813471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf08a0892eb23dfbb8153d37bfe1a1d48ed7eecd037bee835f64a39e0025cbb. 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/TCADR1813472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7988df073379c65659cd9b18c350c2aee31984fbcd5f2909536e3aeca4beb28f. 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/TCADR1813474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343ef5b7ecc87bea7f84cca5a93b82f13deee9f72cd78dff9fc1451f9c52333c. 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/TCADR1813476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3227a8307c96a9b9da0abdb3b2421358a7c817d17393fb0ffc59f9acea38d6. 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/TCADR1813477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5492e25584a63a2e24aff55f5d3d97be1e0be9e02fc30706c8ed16b92123a70. 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/TCADR1813480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1990fcb11d174c7fe74fc9767011d7b30897ffa4e8afc13ea4b6da8f52646b73. 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/TCADR1813482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81b9e1d2ec3e7a100f0095f8b995e98101cbd15d93dc56e27b0e3f85621b691. 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/QZH4F1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84c7bc30b653f889d88ff2ba96e2e0731816f070957371b731c8d478bd36377. 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/QZH4F1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a365e6776d8849a06496a47e5a535e09de0f8c94dc18b709f6f3c7496751c0. 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/USA2P1916975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283e5dff5a6a7ca33a7237a60265b86664a4e86fcd85ada9712df7ca900053f2. 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/USA2P1916976.
Black Sabbath (feat. billy woods & Tha God Fahim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6d8d477f78221fe9fcfdff47c80a8a28e901c4b9ac0c8d655232f19bfcbaab. 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/USLD91753718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0aaa63caf80ec74040a7475b65a0e6f11a6b4d9a0fc1af0c6f9cf942c1adb1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USA2P1916971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28fe35cbf761583aca12a1f3e29933f2d1a14e7a68e3cd742ca9d1469d03684e. 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/USA2P1916973.