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 0x746f00f6caf17c3c5f67b74c0fad59227ccc97084bcde6dd9f6cbabb9590ad01. 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/320bb8cf-636d-44e1-96da-670b10a71467.json and https://artists.proofprofile.net/proofs/artist/320bb8cf-636d-44e1-96da-670b10a71467.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 0xa18c3ee5e62180caf2a2dcfee48f219d9ff288ca4ca37605a23a56a242da32fc. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/RUA1D2114921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540e142bbd127af21680d3271118b61e3be451565a3ed4b067c9c5c55539bafc. 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/RUA1D2391015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942dcc48d2da2e9b3b9c97d6e4ccca03107e18712f120fda3faff6203bd26379. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SMRUS0074651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086c946a1ce5010facca2e1f43f2cf8d68f455e1dc485e3e16b10c9eb08251fe. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/RUA1D2391017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe8dc2234e5942767c6078d99c4fc726626a6cc7b307409fe5f8534297c9f69. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/RUA1D2391018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a016a26d294ba5a768f714b3302d7c9693080f398fac3e5ec4d9a31c9dcd53. 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/RUA1D2391020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5631087d0ce73d52915c0264445db08401ed6754dc31438396a0077669501811. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/SMRUS0076999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3836c9909337240e19214ab8edfbd465f788ebd223a061455da495c012f2f522. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/SMRUS0077501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c1486a1f9de6a9674b0d4db3f9c9cb5a5aa34ef30390cd18fdb386d14c4676. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/RUAGT2442595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35233af9f4d6cd5a17c14bc5cc2fcc299f3de27218ebcb84d3b5107930df5251. 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/SMRUS0078340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80133e68ed6afb63dbc9f7d6ddb5dae5b0117e6d9659f8e30a5bc881b138cab. 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/RUAH62401256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0523dd7ebcc7ec4f23189eec2f4fb64f2fe157ecbdda8e2367b8ca9ed875979d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/RUA1D2587507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8306015655a2ff7d0390fe96d632772f83a5d2ff312c64e16c06254f7ad12842. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/RUAGT2507447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bf74a991b35a20d1808aad7d9710e50f201725497f31371e61ac6343799adb. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/RUAGT2544117.