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 0x6b69fe3a6c4b81c65cad679be41b0b10809ae03e5088beae264df4f3a1928d29. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c2befdd-a447-40e6-93f0-20cd337dfab9.json and https://artists.proofprofile.net/proofs/artist/4c2befdd-a447-40e6-93f0-20cd337dfab9.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 0xed72ca3b032acc16c2d086f15c0e2e896ef08960e8ddf4a41c236a4f8028cccb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA142202708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb17da6cff7886b9804170134018240298dabca21e4f871486997180e804e8d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/IDA142306276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632c4814f41ede3ca5ee21d4a3221d4a590ba19861829b3d1687dbf89ec1d765. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/IDA142306285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed72ca3b032acc16c2d086f15c0e2e896ef08960e8ddf4a41c236a4f8028cccb. 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/IDA142202708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131de97e2e74b16d093a0a136926c2c5ccd8ee1d88e273e561d8a657b79eef76. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA142202710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef594d6dc07ebe8fc381237a9274f630b27d688f3fdaabb32dbbcdd05388185d. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/IDA142202714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07ebefb9c10ac84c9c2b2b359b87ab5887d76e5c396a42912c2a4498fbfe74d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/IDA142315521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425b30a0b3fd9cb2d066d854ffa7820e51bd9a526bebc2f8e38a333e150e6ca2. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/IDA142315522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e6c9924273abc1385e11deee103798643b86b11413ba2224866cd6fa30e0ef. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/IDA142315523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba6e52c508190c6903905a04aef5a7828d55102f7fb21397819dc683488382d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/IDA142315524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9d8311e14c0f16b6314c345a25cea00fcb1282ff6b4c14504c6b38b36e6891. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/IDA142315525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9f3208c0ebd1954de35c1131e4b1e21ebc7029324bd0293dd2d7b468640895. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/IDA142315526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46923a30d2e2cb965120360f040a1fea784c6e99da2329424efbbece19ee81ec. 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/IDA142315527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2024800778cfaa29805f735b74ccac116edc2b9e23aa38d6d8b839d8e23a11e8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/IDA142315528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871ea903c9d2002adebc75226098dc2f99a4fad8ab6033fd8f962334aa67a261. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/IDA142315529.