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 0x0d90ec538b8bbd9cb94641124d02447cb2e96f4ab1a4e8df8fac4b7fb6424e0f. 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/ec93e973-1921-45e2-9466-fe2eea797d9a.json and https://artists.proofprofile.net/proofs/artist/ec93e973-1921-45e2-9466-fe2eea797d9a.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 0x379c0c7d6478a6261c925957f1454d05bd6eae1b9f7581f6d468a3ff880cd85f. 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/PLB380800062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155f6d74d96d2a14d0cdff0ea451251c86df3c4a592ff3f684d66357fb149e15. 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/PLB380800224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f6c7c7c8b47fa051a2c20308a3db3eaa4662809914083a4fe4d73824732bbf. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/PLB380800225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d666f4c8cc8371b952f654eb1f53ffbbf56f1dce6986790c38aae0347b2313. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/PLB380800227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6860cc10a3ecc92df780857317c7818c894ed5e45e7435600af8eaa1947b781. 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/PLB380800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818ea640341d7c120bd92e3641d0e7fc9e2a217f079b6c4f1842e5af1376b63a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FRX620550180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c894028b08930fb45d3e7066466c731674f1e836fb7fe3c22285d2cea4f9c28. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/PLUM71600690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7fc1354399233c37b17aa5d5a52188366167aca8f35b6ed62d21b24322d3af. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLUM71600691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a13d24d7835558b6c597777cc15877e29379a3eddf2cad3611c8b794d6201c. 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/PLUM71600693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39900be05098587b76264a187725efad809f492bb4e3400ab0fa488623dbc0c6. 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/PLUM71600694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4381cdd168123de01ba57bc2ec41fd611bee2c9f89716a8cf6d030e2abd14b13. 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/PLUM71600696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbdabf5a7f506bc7f242a3322e2d2d475990244da9650159b2aaf55676ebe6d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLUM71600697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fbda841cf5bc95bbcca08cf14c65de33f3c624639a0a21aae70c7ff84ad083. 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/PLUM71600698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42da07c52175dec867190adbe9f5ab7fb54ef9a5d15c99f81f048e628c83473d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/PLUM71600700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48c1ba982594c7fab558efdd7b3ca206327e60586a02a70505e759c52abd063. 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/PLC592100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8510687529af54ca9fd041dd5c72564dcaef2d2a756fe572d98ae32f22e12f59. 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/PLC592100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4850a45381792dbab53c84b78ba062dc6218481fcd6799963248f1c1e2ce29f2. 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/PLC592100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1c2c2ea2b17b6f2a9222bccc2c42a6d760a76a12b77d0e7c4863e16ca7bd4d. 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/PLA552300469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1c81c8a1b210ceae7612412c718f97467286363c439b867324f046dd306d35. Chain 2 (Bitcoin): anchored in block 957034 (2026-07-07T11:52:37Z), 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/PLA552300467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a8a0474fdc2a59cd25f26c9741d2b1f7a86c165f4a9e4793d4e4a4662204cc. 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/PLA552300468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1c2c2ea2b17b6f2a9222bccc2c42a6d760a76a12b77d0e7c4863e16ca7bd4d. 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/PLA552300469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7372992b49d749de395c67866dec5779dfd7b3789cdb85170e01a05bc7a38e2b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/PLA552300470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a0ad4e6d561ab773e91b472899fa1afb50522d4e59462ee61253db390034fc. 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/PLA552300471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e54bd257685da2e15e2fd83ad01ed32daedc8502d064d0dce365023d6576c02. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLA552300472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb914c890e6387db595c857c4670cd393f8e7165ee76d2151dce8dba10ec08f7b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLA552300473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b456a70a7303910474d97daf685197a367483e31e612682331a605a821e81e. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/PLA552300474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4111c6e268f543ebc40651df0ab97e970c9ee31bfbd75cca176a664eb95abe0d. 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/PLA552300475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627a62022ef31bfb73e4a68db72636c3242caa9d4501adbf1f33ba3edf6f75d6. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/PLA552300476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669d8760c8f3d34b2029d1380582b94f491fd6dc5b69c64a230ce84e045f5865. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PLA552300477.
Lutoslawski Tuwim. Piosenki nie tylko dla dzieci.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a9f25e3d1fb5cfa3abd1fd049ce12f4094db43ba6c14f27d691da6cb4586c1. 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/PLB381300247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda0f555d5c614587a2f2ab6ab1898bf3ffa4d4c8cb0fd31d03b2a978f1c5985. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/PLB381300245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fd468dfcf6ffce44d5c398d45dd39484fb360417ccb92ab04ac2aab3eeb78b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PLB381300249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb7ee70bb763f9838c1bbac02ed22ed45d342d8f92dcae8a8f0a4e62bf425ef. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/PLB381300253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c3ff6b7643956bb36cf69a43583b7c74c2968a093cebb9d919137a626c4786. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PLB381300250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56b4de7119b4d7e091b840f7a88262cd3ddf8a9a2ca8a6e1b33f9d74442ba13. 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/PLB381300254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e9b9e9a3d025e022db4bd45d0420d779f14b1629d4abd84c0d2aa67fdbfcdd. 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/PLB381300252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef33df408e54e7bdaee24348f698c1fb41962effbd7c2a92e22f24664f72155c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PLB381300251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02be1e6dd1d35f8882ac38d04d812466799470a6855af073b7e59e0f4d73344a. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/PLB381300246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5add022bb1979412f3ac22853b504b2d7da8162b1f3f807ccc8bff66c223e3b2. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/PLB381300248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c60b9834336eca378dc4691e94bd2c1d3dd62e61fe37fc2f8df64a62983df8. 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/PLC281200015.