thumb|A toy motor scooter from 1955 A toy or plaything is an object that is used primarily to provide entertainment. Simple examples include toy blocks, board games, and dolls. Toys are often designed
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 0x2e747766c32878af2fac376226f4debc16cc93a7e52f49c0ccec220c83c4bb85. 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/2a6ea72a-9b27-40f6-99ce-6a226e0ba185.json and https://artists.proofprofile.net/proofs/artist/2a6ea72a-9b27-40f6-99ce-6a226e0ba185.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 0xa7cb9937c65ac8ebc76b413798fc3782a47e7667d4ead20bc4feefb33faecb1f. 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/KRA341503967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9186fcf7b7e2fd09486325d38ad9d8fa054e7923b2f1f1e118765d5da97ae00c. 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/KRA341503973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30589b97071e80ec2c5abe0257ab180cb2e56da2e24a0c9947e61720dbc4988c. 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/KRA491402322.
Goodbye sun, Goodbye moon (With Lee SUHYUN)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f05aa1c207d0090d7ee5d8d4ed868774eeb62734a68fd03011bd10608fe603f. 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/KRA491402323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48703b1207e9277ce6507cb30123b613aaa41d278731180488d10f2bf86cc2bb. 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/KRA491402324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6d4615813dc3509a95719e51be05073045f349a9050d858bff128fb4f2303b. 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/KRA491402325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891ac42c0ce6de5a835024e5d7f716bebcbb5835c046fcf0968a219d2613c91d. 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/KRA491402326.
Life is Beautiful (With Dynamicduo & Zion T & Crush)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfdbf4d1677c588cf4d1c391453c845f4e50d5b87a198c8c1b34aeabcd81aa7. 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/KRA491402327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04999f25192ae80aa3a69ce9cddf79c9faca1e16406fcfaaff05e3f4c6acadd. 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/KRA491402328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4254bcf928dac60c7238b6ad4ba4a9025d6a2542260bdc2224a2efba2595449. 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/KRA491402329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9189abdb957a1e356682e5ad47484052f6e41d440a15ef930f50217235b1cac. 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/KRA491402330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81a0ef40d1b5f79b53ccae8054e70bb53afb273749bd8b99b55e162520f7aac. 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/KRA491402332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4584b375fd893752d97c835fc59a4c6706cc458b9c27624b7b5d7e3d4cef5700. 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/KRF681801125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe409181291b67f0406be32688cba25ff797d92caabffbdb35a7ddd127004ecd. 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/KRA341503837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3f539ea653901708af269b806f6f2b824fcee945c20f220e059782e54bc0e9. 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/KRA341503838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa573840749144775ccb1b6077a5900046dc48aecfbefb5513910c3a72450c1ea. 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/KRA341503847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9762de8fae61110d8b758fd98dcdb4176e42c0b24ed141bcedd16ae00ed5298. 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/KRA382001359.