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 0x999eb6a2faa6b9a901eb3bf78add562839286efcf33a8422eaf205adc3bec783. 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/f4a4f93a-91c8-4e02-ba8b-4bb978283cf4.json and https://artists.proofprofile.net/proofs/artist/f4a4f93a-91c8-4e02-ba8b-4bb978283cf4.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 0xd210f23fd4ce57ec6f6d59334776491995737c9d8f0b9a89e7cb0d0ab30d4924. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/PL51K2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e10a53b90e2f1239f1ee86e70b1e65497a4746fc022cb2c6dc17b864c3c868. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/PL51K2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099300d86a12860e47b1324062eddf74df4af816d073d11c2750e38d8bde327b. 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/PL51K2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1c196c73346107e58fe53ce23c33054856f87ff4d9e0edf08db46974cd686d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/PL51K2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d44d21063c4c22d0d5d94c0de7a417f41f2ba0fde53d5e241a3405a3421610. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/PL51K2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c6094e17658a00b4fcab9eaeeb53998df7d6d40ac30f2c23d813d2b40124c3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PL51K2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e85bf7e0e957999778872b6ba471b4b23c9ea9f6973ef8c5360274eb429669d. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/PL51K2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3417fe7533c56ad0bfb9f73c65f96e95ccf6d0e2992523e1b6ab13e5ef7582c3. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/PL51K2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93706c1a4cd4362414d95b23841f457738955c3b3108067d158358ad5bc6bb49. 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/PLI369605333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe9bc9dc16fa62502bded266d34fad780708e4b9c414d70b0d1d1513676140c. 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/PLI369605335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c72799ab406aa6e7e16e0d422eaf1eb9c482ab3098ecf167bba799f548086c6. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/PLI361077340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b8ffd9583db62d50a7712e14144dbe606a84da922a70f5a8c4edc1116ded85. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/PLI361077330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94729f1ba5c72dc6357f99cf04412d483c48e0befacc98e122b7f5e854951e5e. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/PLI361077350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb419a4db9de7a0334c28e6f80b40d1ee558ad2ae4a0791ccc754e282ace8ac95. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/PLI361077360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff24f1504f6aa42a28e45bd594a85d3e59c365ed42d7603f4d7b848f87c7408. 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/PLI361077370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7237b5763723d820e669f0ba389a4f892fcd995dc4e572ddaba7cc21e613d3. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/PLI361077410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e70eca44e74ab07d45b90a6aa17c49329f829a5db1d022fa48d6cf5bbb723a0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLI361077470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329ba7ef02270965aeebd44862f8ee2260663651e5be70ae52d2947e43c4cceb. 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/PLI367090980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32475f0da98c35166faec756f001b505db033782e10f75bb00374dad7f08139b. 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/PLI361456140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027efe8dff939010a6f27d23bf7f635ad7cc66abd286a6eef62eae283fe15f5c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZMHN2294766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97abcedbacd8882faf814545a935bd5812677639f7c22e65a8abfb9cea97ebe9. 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/PLUM72100131.