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 0xe564ce4853c67ff09466db62f351eb506ac95fffb046921bd3e3c9651c1ed9ec. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52043196-5e6f-40bf-b6e8-2b4ec63564c3.json and https://artists.proofprofile.net/proofs/artist/52043196-5e6f-40bf-b6e8-2b4ec63564c3.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 0x6b5d20f48f232b8834673235e12b86e118589ebdafab238302d1e5ffc724d27d. 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/BRHBX1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4306186e10cd774e5c6d37db3999df36cebcc68e26a8fedaa2efe6ac422cca1d. 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/BRHBX1300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43960f998837d2c8d22be160b882c86afb6eb073d19a6ffb1dfc8e337b3fb0cb. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BRHBX1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b5a4a310b310cc263e5cee8e22f11c85e7bd99a822ef0d0e0d3b412d1722e7. 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/BRHBX1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbe038a5a00c1cb4341b1f7ffae1a777d4aa43301fad3fea39d302c416e2a27. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BRHBX1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecab206792818708ffc95b0d5a89ffefaee4ed38090313f2fd0d93129cf70abd. 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/BRHBX1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ce3d9eff68370826fa2b1b69ff079b7bbb8f189618244ba4ec89c51cda3f75. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BRHBX1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811d3b2215cf4bed2be6f83d6fc0d40e62994a3947f618f89469dceb0f14d18d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BRHBX1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d745b84e4b3cc0b000a59582dc5d88d45588f69f07ddf903055b3db1a4153c6. 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/BRHBX1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11e2abab308f94ce4838dcdd2e23ce6bb4b24c73614364340f130796bc58b8c. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/BRHBX1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe956d8a43826208331bfea08f395e3de89a0c0765f7514b7b58321da74dac8fd. 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/US6QR2300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe956d8a43826208331bfea08f395e3de89a0c0765f7514b7b58321da74dac8fd. 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/US6QR2300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae57b9c65d266075a2f4dbc200986f2cde3f290b6a296857ab47e397a398ebf. 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/BRPOU2000096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf86d8fd6f460381962feb349ce73703052af974e19e776b41ba40cc28f50730. 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/TCAJM2567093.