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 0x755fe8940b6275c17a97719ce2df92ea5ee1a2e89b52000ac5cebf4a2ba4dc49. 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/a5ff3f90-a699-42bf-9a30-6f7b21b4a963.json and https://artists.proofprofile.net/proofs/artist/a5ff3f90-a699-42bf-9a30-6f7b21b4a963.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 0x28d07916b4df4e3ba13968ad38945c9c7b480031c8ffebcd3966624c6467a326. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/ES8240222503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2038161ccc0395a7455edb680356f85a8fe3cb3adcfe6c4e0661a2ac8ba64e3. 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/ES8240222506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41c41bf4e5fb4a41b69bce4189a2bdc6732ba633c1e9f12df91fbfc16b14b6c. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ES8000423503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266837b934f4fdfb9a509821fe180af1eb60eff0a938870e364d907b58e11458. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/ES8000423508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23991c6d5b3107966fc7b0e83a8580b70bccbf5dfbe278647d0b3ec914e3ad5d. 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/ES8000423516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7381ff4f32e40de848e8a25d6804f54e363668cdaf0452f836821fd8328b943b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QM4TW1701568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83eeb37c34acfa1d6e4255c3d8ec4622761866bff9d122d2b5c86f0ea9667f10. 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/QM4TW1701572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402214d8763df206efce1a8cb70940cfa2574d1ba3a7b7d3fdffa8088a8a4170. 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/QM4TW1701575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08abf1bd22d31f3d729c6460ae84300a0d19f79bfcaf92dacf99d08600815e6. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QM4TW1701576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8132823e28bbf32029e0efaaccb3d4a70acdf2b79e64f71aaa6b28d2b7dd5d78. 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/QM4TW1701579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bd179c6ce1eaecc7584da8cd98dd0b265f99e0d7084077da28592493955749. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QM4TW1701447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd0d33ede38838c778fd80f823dec07181e35fd17e822755cc9af3c444ae206. 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/QM4TW1701450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c817b2c7b5bb554055cdeadfee46faf2cf05a94209e1fc062d7f23254019546. 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/QM4TW1701453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecee5af086ae1d7244790a450ebbdfa63efdf4d9c53c88543a8ddd6854b1932. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QMFME1589194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5534ef039ffb4cfca58a6ad479845a69ad9b6dbe84458e251a2b4bef93d6e7. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QMFME1589196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558b5e8c4e99819f8a4f00bc8360a0825d5aa8e2dcb6ee31e799ad6abaa3b3c4. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QMFME1589197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3089c280673d8a7e8851073d310c73cef8799f61b6f1f2be1e140704471f6f15. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QMFME1589200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9add2c3173556e10866d067ad5de70777972f51940943e064ef83b8d1a54bcf. 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/QMFME1589202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f03b76258607fe4f9976ee84f835a6ebd7f7fdd066653af339b27be028561d. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QM7281842794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f79852a33860420fbce03453f07a70145c60e06ee8f62a0e41a8e488819dc5. 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/QM4TW1951879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6cccd1cb9e8441d4ca2aa6d1c7b30e7f2424651ac688120b66cec505899774. 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/QM4TW1951883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cca15bba5458619222f622c9e5fc4499e0d04ec1c179cf559beed8a1e01aaf8. 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/QM4TW1951890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de0b8131003bc15e55f55c1d5185fbc608679d46db56c5e8dc7c404450dc79c. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/ES31E2205001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e31d0f5c1f0014b1776e27aaf3fb694527124401a90e4710fc15bb75d0e057. 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/ES31E2305503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81faa4d8d0cea5fdf53ea7d5291d8958c0fa06f4ccdd8c7a0b7622aee68f2d6a. 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/QM4TW1611155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc236a798e0fe49200ce4c7adf648da7e3af2e8319334d7253a4ce718ecbe6b77. 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/QM4TW1611156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea874310eef4b76c7c77587cc6b4368b6cb2ae3af888fd8ea3584ade4f144dbc. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM4TW1611157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4ccf4d868417d4a9ee501935ab4dfc3449717b57a56987c6e33b4aeddca6ee. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM4TW1611158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacbcd0f9bad641302d0b3d07680909886fad275b4e070e20e800886defb4705. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW1611159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ca86aacdae32474fbb2e9bc753f2725aad2e8980464672d4af494b67420d3f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW1611160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd86e4d027b327cf1a5565dc626ea5be657b897f0f56d15a002540b68bbe0673. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QM4TW1611161.