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 0x70c0e4fea0af44c5f71e8fda479ae64ed3e78fe2f79ee31e404036538ee03af3. 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/ec08558b-cb6e-4d05-80d9-4e5a95b873c5.json and https://artists.proofprofile.net/proofs/artist/ec08558b-cb6e-4d05-80d9-4e5a95b873c5.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 0x43587ad6d48b6a458693be3e89ce4034be90c3638e4d56bae2c6aebb213e694c. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/CA5KR1711496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d01784e5a7c0d5f36f00fdbc3e8fdb658c1eef91764d62985db3d7ece865f2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBKQU1833154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a82f306046559c0468840bad4a3874faec79ab0e2d5f95e05da8e61abd9a1a0. 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/DEY471818650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc528f4b5297e4ab3c5be827f54b5013f6fc6b0e7f91046688434e9aca7289ea. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DEY471818653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792d09fd29eb1bcbdd5160cba791fb83b7c5debc263cc30d9911716d0283bf5e. 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/GBLV62039905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef612ecdddad80127adb5edff4634989c986db66fda78260770bcc446ff1272. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:22:46Z), 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/DEY472171358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaa1c3cdc68335f23a1e7d97d6eff054e361a23a1b06f7d435e30171907396c. 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/GBKQU2232310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e27c7e4bb51d243c49f1e6bc66a996a4ceaeff6cf0c359b342853e5244c9b8. 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/GBKQU2232311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893c174f42a0384c0d6b17a071e440aa9ac7a31d32b19e60fd6a2f1a035fd9d2. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/DEY472375208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250cc99d0ee5ee1b8e7f91e07179a499f146b518cc330add6da5073484db5fc8. 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/DEY472375209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87147a7c4def014e37a52ceccf63c7bcb549cf890ad9133f3fc4866c437d904. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/DEY472375210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d68d40b3d76523f8e541367521d6e9a73c9913b1cebf297022d37105264e06. 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/GBKQU2449461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a62f43a51c7bca6700e3cdbe18a0a086a633ff6fdf3ee48e0e7d0f11ad3db75. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBKQU2449462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41583f0b0751cc8034f07e8471236e7345e15eda301673157930adf09682e5b. 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/DEY471982571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023909b9a92346d29279edcbef8c6098b84f2c25e23e149de860e87ab543a3ed. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:06:25Z), 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/US83Z1929601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b1d381c40a9f569282eddd6440ac9e3585beb9ec11479293592def7ba522a2. 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/DEY471982200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f976122c464c4dc843e60bc2e9cd25e205e618308ec6dc3fa10d947469e52c. 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/DEY471982201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4448f788cec59a42af47171fcf2297e42ce3d8cc9f0dae5ea2961db84c3581f. 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/DEY471982203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42a0025b7663b7cdea66f42af1f9aeb4a58dc7514868c7e62d4e1e7325fffd4. 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/GBKQU1981145.