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 0x7ae68487922fc33f5a12f5e176cc59ab09710696a5a445a9438b9b6145a8bb58. 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/0324a0a6-29f0-49a2-84ce-795b7c6b99bf.json and https://artists.proofprofile.net/proofs/artist/0324a0a6-29f0-49a2-84ce-795b7c6b99bf.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 0xe64549c20f2296b81db7253453939fadf9f91e09a26499cb3bf55a374ef0011d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/PLC062121271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b9d5fdb2b9a431bdbf49afedbf607fa4e658de46694e05d53d443acd3eeb26. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLC062228110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbab7390e37f93aeffe16a60df0347cd3eb5d727a2689d8f2474ee6d50e52c2. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/PLC062251895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccb38e5cd3bdb701cf0d4c6640fcb4df99d3800d8b476e5f693e77e21b0657a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PLI368568460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3bcdaa50f1dc2187c4ca5d761092f682c5b1ca6a3babf638e4b36c7b7cf786. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/PLC062382716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16164d6734a0361e4ede8f8108aef31d1dbf92142ef2d3baa6ba86b13f70d6ba. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PLC062387088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1f4488cecaebac944ca22f1d37083dfea7be4cff15e343a27b2e67a0b355de. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/PLC062386958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73165565eb76c7bd25fc6aa568cd773e750edbbf3666873b420588ce6d182e53. 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/PLC062411229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2843d03b0bd548868df0d7ee4d3c47c85699daf7ae0d317b9cbd44da2955b022. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLI364384710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b64fa6c8d33306d63274573e441401e643de214298364862e8b867023215643. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLC062420007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc860df4ebd89e553f4d591ead9e6d06f0bfe4763be6058f703b27b661eab587e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PLC062422951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52af213353c35bd9b34f64efc93cac3f2279d1a3b80dbe4fbd9b1e973014d8c6. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/PLC062427891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01f78573c89ba8ace512c7905d436aa43c9afefaee31dc3f648740f8151cb1b. 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/PLC062500633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efe6dd7998ffa26d255e93da49df2d74a63d6a718f29e0cd1bc8e84a2a973dd. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PLC062501928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa940a5e57aac30e2071fe1181199067bd4bc97ff08d348ccad9198813cc3c39e. 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/PLC062506276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf024174319285ad11356c3dd8f5bc42c93a354240c5875a183477f81b852ba0b. 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/PLI368470790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe066ba12e4bc4b3e96e5dcb2159649e9f84c23c7cd902161f2cc7ce0c3dbc13d. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/PLI365507070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20da6c3c09c1967a6ac72ca70a184977e9ff6394c47a9555fa528d3656c0fda0. 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/PLC062405334.