Holder may refer to: Law Holder (law), a person that has in their custody a promissory note, bill of exchange or cheque Holder v Holder, an English trusts law case Holder v. Humanitarian Law Proje
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 0x358ba99b793b3ed22e7cc3314dd2204fb75370937c2ffcd467e6909988025919. 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/a1a9394e-157e-4d2d-8211-0725bade3e7a.json and https://artists.proofprofile.net/proofs/artist/a1a9394e-157e-4d2d-8211-0725bade3e7a.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 0x87dfca46470683c004f2b2c2731ed6527bb165adeaf03caf0cfcbb21a477141e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCACQ1643507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965b0400446fcd5a014db025e26e198a5daaea5586c14e23f54f17cafa1ceef9. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCACP1603693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3944133fc34a21f30ef64a7e22c52f609df08e3898822b11468493341a30b75a. 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/QZ22B1739594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87abf11ab3f988fcc25c14eb59b492af51fca227bdffee9fbdb9f5b5ade5f6e. 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/QZ22B1739595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7bcb0604ed971fbd53644c0df5ef543bddb1b05cf0ccf87c591bb387e8260f. 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/QZ22B1739596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8966ebee4f4ce508f55ae9d7e785eed8d9c78e6c0bd084a5f7efc05d4638d7ff. 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/QZ22B1739597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a03514d1189ba7c8ca21f5914d1de2f242a651531ba6270c4a9178fc9ad0119. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZ22B1739598.
Lavender Town (From "Pokemon Red and Blue")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd7345a2798eda21c3537cbb0a59c784c48947b18b1367dd13f08343bdd3685. 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/QZ22B1739599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b83406c4fbbf0523078782bcba61098fee9365a75ef2bd093d091490800c2d4. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZ22B1739600.
Overworld (Light World) [From "Legend of Zelda Link To The Past")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ab545d6efa86214323fd5cb12606fa5513692b4a1f9b52c88bcbfd68db6ba1. 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/QZ22B1739601.
Rainbow Road (Smooth Mix) [From "Super Mario Kart"]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e98c1586a7c04772cb7ceda33b094d0b4eb3098e2065cddcd68b23f47ca78c8. 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/QZ22B1739602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a12017c529da1ccc5d64cef75750928915040cafc1b916f5640b472f506c36. 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/QZ22B1739603.
Chemical Plant Zone (From "Sonic the Hedgehog 2")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88dcdda9e31d1898df5e2a4ffb4504ead1cce3a5c8739e1660e0626000ce4c07. 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/QZ22B1739604.
Pursuit ~ Cornered (From "Phoenix Wright: Ace Attorney")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43fc00fdad17e7652bdc68aba1496c48b31f7fa090fbb803438c8d57519eb65. 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/QZ22B1739605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15770b44f74bd341346b2e8c725c28051491279562b05de7d7cf7e688e37a61f. 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/QZ22B1739606.
Aquatic Ambience (From "Donkey Kong Country")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797e22b6e9c06c55f56fa32c94fdcc98d999b6124727e5965a12fce3181660e6. 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/QZ22B1739607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e982cc164fca4c427732e59fef8da71f930f0d1e41bc1b084746d23aa0fc5bb. 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/TCACG1559150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bccc54ed85f5e395ba44e10e6a2a1354d46b74f73606df58c9b343dd0092eab. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TCACK1539976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbeabdded42bc908862c012718d452f4e9f263ea92f541baea56f4fe1015deb. 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/USE831543936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e722c3f82b528c96d4f9ed8dfea13a87eb8ebcde5f43aa4ff3af6406487139. 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/USE831543937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42a532685a653da47bc27b6bc22a7c629422622c22ce394a0e7817bec64bd24. 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/USE831543938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6a7222c9c9f6ce386ecc008f42c340c41469595e6030b314e6bd46d936ddd4. 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/USE831543939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b23ac7147a515a526f5ab8cac806d92e965a3ae22f71d61fe543a991a049e68. 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/USE831543940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d35eea51126be2226ee93cacd4d70cc506611e4803e43334253dd043a6adc7a. 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/USE831543941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00fb65383e3bd22337a8fb404487e135e284d2f8f5957d704caa751334b45e0. 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/USE831543942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac7602947d1f2f9009b1d87aefa20fd4d887d7529976a02779fb478c7274d3e. 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/USE831543943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65cc90c99dbe24f905a1129dd7c492292c2969431ade6431616fd25e3b52e52. 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/USE831543944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f65176cabf67c36f5542fd048648e2ef76c0f9126ffd038960510d4f122d40f. 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/USE831543945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d0b4f3fba1dc32da2b1b1f203c57c54ca6558e12cd3df988a47c14de0a39c3. 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/TCADX1857152.
Victory Fanfare (feat. Ephixa) [Final Fantasy VII Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb7f3f9ce9ab4b405dd8c4848c1503198af5cdd546cc64b4241b1362bb08455. 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/USE831565615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a0d9fb2fd3c8600b50e4c6299dc9c9b01e69a2501cb8e1137625fbc525d275. 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/TCACJ1580186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316f505032984b771ce2472da913eb6d231c131a9d5ba44cd9a67bb02b2ed20d. 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/QZWFQ2321410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1840643bf0f8a2676cf66aa85275c81555c4704f32f1b1ae6ae392ee0cafe0. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZWFQ2321411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7606e9fb260337fc576ef31efad511c8c08f366099bf9b9c0504be3c17603147. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/QZTBB2446140.