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 0xb64d85ba37a00df21d28bbb3ed17e1ead39a8c7da85f5e411025f91fa1f2ba2f. 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/8df9734e-fbb3-4c8a-9f10-5181233d9cb0.json and https://artists.proofprofile.net/proofs/artist/8df9734e-fbb3-4c8a-9f10-5181233d9cb0.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 0x1f6c721e7d2774b7480f1f1c9d34bf5886186a041b9d2b64d6f03dfdfc06d084. 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/USHM21808750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4eb18251a008775c77cf8ad2604fe9ec40ab61a5ed3c22752db2c98d115fe45. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM21808751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cd425bfbcfb3249f765f3f7674c68c7b1d2c493c630fcba3285475c2a9409b. 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/USHM21808752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b179e3e2d07a8c66737bd689fdd808c83caa2a05295e707234afcb989ccc99e. 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/USHM21808753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3aa1ced6b3298ef6c121be02141eebc43a961e9ae2a3df1bed5cdc7c320baa. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USHM21808754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbad8b5cdc25b7cc8a6853d4076ff6fe34db56f3db32434249dad312ed27f17. 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/USHM21808755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4463fd91a02be79feda14c586cf7b9b0f24b21a4abeb630dbe88f53a61730f73. 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/USHM21808756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c3dcb98d0a5c0770302a812ad6b94122a9d3c9911222e346adf94ff7678aca. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USHM21732584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5183ae5b966ebfd76a45840eb206a085bede71862c4531bb3068814c2fd7aa2. 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/USHM21732585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8f5d00689abf8119da554795bb90f099186d0dc9e979dc5ed185494cade83f. 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/USHM21732586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ed612032bff4ce8b2575bac71c28fa43c623ed32f85f1fd10b448f8e7acc28. 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/USHM21732587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa7f35f8127f709db5505ae5b901c1c0cdd660cfdcf942a610b6e0ef449aee0. 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/USHM21732588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3ac728ee8484ae9f23506b1cf9e126853e8cea592a4dcedad54bc28069aa05. 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/USHM21732589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb909717008e1b39d413df2abfd31b933d4da74f5f894696d811113386ab86a6b. 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/USHM21732590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bdc2c74e4a1f6cf4582adb00c6a2d1cfdfa137cba45be2cbdb69840b13cb7c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USHM21732591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2c89e30db85838ba6cdb5d23b05a60837c585444ad759988030c5606a892e0. 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/USHM22068393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b2b052350099bf5dcb7539417e71ec1ded8e8115ff16ac2df599305b6383f1. 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/USHM22068394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504bed0e383eb34a842e2ac11fb2db89d175a394e370a5bfd5e582b8400c01c5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM22068396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ba5752a41dbadec222a2f71d60eed68a3f877efa6d573a70ac042820806eb9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM22068397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc76083b41122a458666d5b938febb7a0becfbabe9f8871a18ac924a5b4c31c9. 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/USHM22068398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd48f5fa8276efb13c6e53b4b99a4d2f6bd96740f3b780f41b268c5cc1eb58d9. 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/USHM22068399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61dbffb053af17fd323870acd9aa76050f1b59d6ac331412765d79b957341ae. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USHM22068400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b35e74e4960841a30cc5059781e669f22e01b0cfdcbb12f56b7a183b980bbaa. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USL4Q2241132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f85bbbfeb39cd1465095d85c9a1e6c9afbb9ed7812d0e0cb37fdd379be01bf. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USCGJ2283999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5cda8de798591ba66cfd90fdbff49d2eb6e2366edc196286e9537b0f830f20. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZTAZ2398556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2805fad8264e1bf3bd69f5ebab97644a6a9d00eeea806dc64a7b16c0a730f21e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTAZ2399326.